Classical locality Vyskočilka in the Barrandian Basin displays a well-exposed section of black Silurian shales penetrated by a ca. 10-m thick diabase sill. We examined the petrographic character and mineral composition of the intrusive body and enclosing shales, as well as the hydrothermal veins cutting the rocks. The diabase is a rock with basic affinity (paleobasaltoid), which was strongly influenced by post-magmatic alterations including albitization and zeolitization of feldspars as well as chloritization of clinopyroxenes and Fe-Ti spinelides. Host sediments show variously intense thermal overprint at the contact with the sill. The predominating Silurian shales are rarely accompanied by laminites, formed by siliciclastic material, calcite, apatite and probably also a pyroclastic component. A minor component of all sediments are Ti-rich chromspinelides, which are classified as chromite, magnetite, and spinel. Chromspinelides form isolated euhedral single crystals reaching up to 50 µm in size, as well as their intergrowths and fragments, which all do not display marks of abrasion due to transport. We therefore presuppose that they represent relics of ultrabasic pyroclastic material (volcanic ash), which was deposited during sedimentation of Silurian sediments. There are known few sills of Silurian meimechites in the Prague Basin containing chromspinelides with comparable chemical composition, which can thus represent a likely source of chromspinelides. The vein hydrothermal mineralizations, present at the study site, probably originated during different geological processes. The calcite veins with minor quartz and hydrocarbons likely formed during Variscan tectono-thermal overprint of the area. By contrast, the vein mineralization containing calcite, quartz, titanite, anatase, and Zn-Fe-Ni-Cu sulphides was likely associated with contact-metamorphic processes related to intrusion of diabase.
{"title":"Příspěvek k petrografii a mineralogii lokality Vyskočilka (Praha-Malá Chuchle, silur Barrandienu)","authors":"Z. Dolníček, Dalibor Velebil, Jana Ulmanová","doi":"10.46861/bmp.31.047","DOIUrl":"https://doi.org/10.46861/bmp.31.047","url":null,"abstract":"Classical locality Vyskočilka in the Barrandian Basin displays a well-exposed section of black Silurian shales penetrated by a ca. 10-m thick diabase sill. We examined the petrographic character and mineral composition of the intrusive body and enclosing shales, as well as the hydrothermal veins cutting the rocks. The diabase is a rock with basic affinity (paleobasaltoid), which was strongly influenced by post-magmatic alterations including albitization and zeolitization of feldspars as well as chloritization of clinopyroxenes and Fe-Ti spinelides. Host sediments show variously intense thermal overprint at the contact with the sill. The predominating Silurian shales are rarely accompanied by laminites, formed by siliciclastic material, calcite, apatite and probably also a pyroclastic component. A minor component of all sediments are Ti-rich chromspinelides, which are classified as chromite, magnetite, and spinel. Chromspinelides form isolated euhedral single crystals reaching up to 50 µm in size, as well as their intergrowths and fragments, which all do not display marks of abrasion due to transport. We therefore presuppose that they represent relics of ultrabasic pyroclastic material (volcanic ash), which was deposited during sedimentation of Silurian sediments. There are known few sills of Silurian meimechites in the Prague Basin containing chromspinelides with comparable chemical composition, which can thus represent a likely source of chromspinelides. The vein hydrothermal mineralizations, present at the study site, probably originated during different geological processes. The calcite veins with minor quartz and hydrocarbons likely formed during Variscan tectono-thermal overprint of the area. By contrast, the vein mineralization containing calcite, quartz, titanite, anatase, and Zn-Fe-Ni-Cu sulphides was likely associated with contact-metamorphic processes related to intrusion of diabase.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A piece of iron slag was found on an archaeological site near Boršice on the SE margin of the Chřiby Mts., Czech Republic, which is known by occurrence of artifacts from the Early Neolithic (5700 - 5000 BC), Bronze and Early Medieval Ages. We present results of laboratory investigation of this slag. It is composed mainly of fayalite laths, which belong to two generations, less occur glass phase, wüstite and leucite, exceptionally also metallic iron. The composition of fayalite displays unified chemical trend and ranges in rather narrow span (Fa93.7-96.3 DCS1.1-5.8Fo0.0-5.0Te0.0-0.2). The glass phase contains in addition to common compounds (Si, Fe, Al, alkalis) also elevated contents of P and Ca. The microstructure of the studied slag as well as chemistry of individual phases are very homogeneous across the whole sample. We interpret this slag as an iron smelting slag, originated during production of iron from ores using the direct method. The used ore was in all probability a limonite bog ore, whereas the use of local fresh and/or weathered pelosiderites is not probable on the basis of the recorded phase composition and chemical compositions of individual phases.
{"title":"Železářská struska z polykulturní archeologické lokality Boršice v podhůří Chřibů","authors":"Z. Dolníček, Ladislav Kandrnál, Jana Ulmanová","doi":"10.46861/bmp.31.018","DOIUrl":"https://doi.org/10.46861/bmp.31.018","url":null,"abstract":"A piece of iron slag was found on an archaeological site near Boršice on the SE margin of the Chřiby Mts., Czech Republic, which is known by occurrence of artifacts from the Early Neolithic (5700 - 5000 BC), Bronze and Early Medieval Ages. We present results of laboratory investigation of this slag. It is composed mainly of fayalite laths, which belong to two generations, less occur glass phase, wüstite and leucite, exceptionally also metallic iron. The composition of fayalite displays unified chemical trend and ranges in rather narrow span (Fa93.7-96.3 DCS1.1-5.8Fo0.0-5.0Te0.0-0.2). The glass phase contains in addition to common compounds (Si, Fe, Al, alkalis) also elevated contents of P and Ca. The microstructure of the studied slag as well as chemistry of individual phases are very homogeneous across the whole sample. We interpret this slag as an iron smelting slag, originated during production of iron from ores using the direct method. The used ore was in all probability a limonite bog ore, whereas the use of local fresh and/or weathered pelosiderites is not probable on the basis of the recorded phase composition and chemical compositions of individual phases.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Pauliš, Stanislav Kopecký, Z. Dolníček, J. Sejkora
Sulphide mineralization was found in relics of mine dumps from medieval mining near Utín, at SE part of the Havlíčkův Brod ore district (Bohemian-Moravian Highlands, Czech Republic). It is represented by pyrite, Fe-rich sphalerite, chalcopyrite, arsenopyrite, galena (with chemical compositions corresponding to other occurrences of this ore district) and more rare jamesonite and boulangerite. The main Ag ore was probably Ag-rich member of tetrahedrite group - kenoargentotetrahedrite-(Fe) with empirical formula (Ag5.45Cu4.48)Σ9.93(Fe1.75Zn0.32Mn0.01)Σ2.08Sb4.00S12.05. Another interesting mineral found in this association is Au-rich silver with Au contents in the range 53.35 - 56.40 wt. % and average empirical formula Ag0.60Au0.39. Schultenite, minerals of the pharmacosiderite group and inhomogeneous Fe-arsenates were detected from the rarely represented supergene mineralization.
{"title":"Sulfidická mineralizace s Au-bohatým stříbrem z Utína v havlíčkobrodském rudním revíru (Česká republika)","authors":"P. Pauliš, Stanislav Kopecký, Z. Dolníček, J. Sejkora","doi":"10.46861/bmp.31.025","DOIUrl":"https://doi.org/10.46861/bmp.31.025","url":null,"abstract":"Sulphide mineralization was found in relics of mine dumps from medieval mining near Utín, at SE part of the Havlíčkův Brod ore district (Bohemian-Moravian Highlands, Czech Republic). It is represented by pyrite, Fe-rich sphalerite, chalcopyrite, arsenopyrite, galena (with chemical compositions corresponding to other occurrences of this ore district) and more rare jamesonite and boulangerite. The main Ag ore was probably Ag-rich member of tetrahedrite group - kenoargentotetrahedrite-(Fe) with empirical formula (Ag5.45Cu4.48)Σ9.93(Fe1.75Zn0.32Mn0.01)Σ2.08Sb4.00S12.05. Another interesting mineral found in this association is Au-rich silver with Au contents in the range 53.35 - 56.40 wt. % and average empirical formula Ag0.60Au0.39. Schultenite, minerals of the pharmacosiderite group and inhomogeneous Fe-arsenates were detected from the rarely represented supergene mineralization.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A body of dolomite marble near Chotěboř was found in migmatized biotite paragneiss of the Moldanubicum directly on the border with migmatites/orthogneisses of the Kutná Hora Crystalline Complex. The area underwent significant tectonic reworking of rocks along the Přibyslav mylonite zone. Therefore, only small relics of early prograde HT/LP metamorphism at T > 650 - 700 °C were preserved in this marble. They are represented by the assemblage dolomite+calcite+forsterite+Zn-spinel+clinohumite ±Ba-phlogopite and rare baddeleyite. This mineral assemblage underwent strong low-temperature retrograde metamorphism (< 400 - 300 °C) under the conditions of high H2O activity (XCO2 < 0.10 - 0.15), which was manifested by almost complete serpentinization of forsterite. Partial alteration of clinohumite produced serpentine with numerous inclusions of a TiO2-mineral and rare sphalerite. The examined serpentine marble (ophicalcite) is lithologically and mineralogically similar to the dolomite marbles found in the Strážek Moldanubicum.
{"title":"Forsterit-serpentinový mramor s klinohumitem a spinelem u Chotěboře (moldanubikum; Český masiv); příklad retrográdní metamorfózy dolomitického mramoru","authors":"Stanislav Houzar","doi":"10.46861/bmp.31.010","DOIUrl":"https://doi.org/10.46861/bmp.31.010","url":null,"abstract":"A body of dolomite marble near Chotěboř was found in migmatized biotite paragneiss of the Moldanubicum directly on the border with migmatites/orthogneisses of the Kutná Hora Crystalline Complex. The area underwent significant tectonic reworking of rocks along the Přibyslav mylonite zone. Therefore, only small relics of early prograde HT/LP metamorphism at T > 650 - 700 °C were preserved in this marble. They are represented by the assemblage dolomite+calcite+forsterite+Zn-spinel+clinohumite ±Ba-phlogopite and rare baddeleyite. This mineral assemblage underwent strong low-temperature retrograde metamorphism (< 400 - 300 °C) under the conditions of high H2O activity (XCO2 < 0.10 - 0.15), which was manifested by almost complete serpentinization of forsterite. Partial alteration of clinohumite produced serpentine with numerous inclusions of a TiO2-mineral and rare sphalerite. The examined serpentine marble (ophicalcite) is lithologically and mineralogically similar to the dolomite marbles found in the Strážek Moldanubicum.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We have undertaken a study of the rare ammonium uranyl sulphate mineral, ammoniozippeite, from the Jáchymov ore district, Krušné hory Mountains (Czech Republic). It has been found on a few specimens and forms rich crystalline aggregates in thin cracks of supergene altered rocks with uraninite veinlets in association with gypsum. Its radially arranged aggregates are composed by well-developed flattened acicular crystals up to 1 mm in length. Ammoniozippeite is bright yellow and locally even yellow-orange with pale yellow streak and fluoresces yellow, weak or dull under 254 nm and 366 nm UV-radiation, respectively. Ammoniozippeite crystals are transparent to translucent and have an intensive vitrous luster. It is a very brittle and at least one system of perfect cleavage (along {010}) was observed. The quantitative chemical analyses of ammoniozippeite agree well with the proposed ideal composition and correspond to the following empirical formula [(NH4)1.96K0.11]Σ2.07[(UO2)2(SO4)1.98O2.06]·H2O (on the basis of 2 U atoms pfu). Ammoniozippeite is orthorhombic, the space group Ccmb, with the unit-cell parameters refined from X-ray powder diffraction data: a 8.7862(13), b 14.1579(19), c 17.162(2) Å and V 2134.8(4) Å3. Vibrational (Raman and infrared) spectroscopy documented the presence molecular water, ammonium, uranyl and suphate units in the crystal structure of ammoniozippeite.
我们对来自Krušné霍里山(捷克共和国)Jáchymov矿区的稀有硫酸铀酰铵矿物氨锌矿进行了研究。它在少数样品中发现，在表生蚀变岩的薄裂缝中形成丰富的结晶集合体，并与石膏伴生铀细脉。它的聚集体呈放射状排列，由发育良好的扁平针状晶体组成，长度可达1毫米。在254 nm和366 nm的紫外线辐射下，氨zippeite呈亮黄色，局部呈甚至黄橙色，带有淡黄色条纹，荧光黄色，弱或暗。氨拉链石晶体是透明到半透明的，具有强烈的玻璃光泽。它非常脆，至少有一个完美的解理系统(沿{010})被观察到。氨拉链矿的定量化学分析结果与所提出的理想组成一致，符合如下实验式[(NH4)1.96K0.11]Σ2.07[(UO2)2(SO4)1.98O2.06]·H2O(以2个U原子pfu为基础)。氨zippeite为正交晶系，空间群为Ccmb，单位胞参数由x射线粉末衍射数据修正为:a 8.7862(13)， b 14.1579(19)， c 17.162(2) Å和V 2134.8(4) Å3。振动光谱(拉曼光谱和红外光谱)记录了氨zipeite晶体结构中存在分子水、铵、铀酰和硫酸盐单元。
{"title":"Ammoniozippeite from the Jáchymov ore district, Krušné hory Mountains (Czech Republic) - description and Raman spectroscopy","authors":"J. Sejkora, Z. Dolníček, J. Plášil","doi":"10.46861/bmp.31.001","DOIUrl":"https://doi.org/10.46861/bmp.31.001","url":null,"abstract":"We have undertaken a study of the rare ammonium uranyl sulphate mineral, ammoniozippeite, from the Jáchymov ore district, Krušné hory Mountains (Czech Republic). It has been found on a few specimens and forms rich crystalline aggregates in thin cracks of supergene altered rocks with uraninite veinlets in association with gypsum. Its radially arranged aggregates are composed by well-developed flattened acicular crystals up to 1 mm in length. Ammoniozippeite is bright yellow and locally even yellow-orange with pale yellow streak and fluoresces yellow, weak or dull under 254 nm and 366 nm UV-radiation, respectively. Ammoniozippeite crystals are transparent to translucent and have an intensive vitrous luster. It is a very brittle and at least one system of perfect cleavage (along {010}) was observed. The quantitative chemical analyses of ammoniozippeite agree well with the proposed ideal composition and correspond to the following empirical formula [(NH4)1.96K0.11]Σ2.07[(UO2)2(SO4)1.98O2.06]·H2O (on the basis of 2 U atoms pfu). Ammoniozippeite is orthorhombic, the space group Ccmb, with the unit-cell parameters refined from X-ray powder diffraction data: a 8.7862(13), b 14.1579(19), c 17.162(2) Å and V 2134.8(4) Å3. Vibrational (Raman and infrared) spectroscopy documented the presence molecular water, ammonium, uranyl and suphate units in the crystal structure of ammoniozippeite.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Pauliš, Libor Hrůzek, J. Sejkora, Oldřich Janeček, Ondřej Pour, Bohuslav Bureš, Blanka Šreinová
Zeophyllite, tobermorite, kenotobermorite, fluorapophylite-(K) and associated zeolites were found in cavities of Cenozoic basaltic rocks of small abandoned quarry at western slope of the Křížový vrch hill (443 m a.s.l.), 1.5 km NE from Cvikov, 13 km NNE from Česká Lípa, Lužické hory Mountains, Czech Republic. Zeophyllite forms colorless spherical aggregates with pearly lustre usually 3 - 4 mm in size, aggregates with diameter up to 1 cm were observed only rarely. It is trigonal, space group R-3, with unit-cell parameters refined from PXRD: a 9.362(2), c 36.470(12) Å and V = 2768.3(1.2) Å3. Chemical analyses of zeophyllite correspond to the empirical formula (Ca12.84Na0.07)Σ12.91(Si9.83Al0.26)Σ10.09 O28(OH)1.43 F8.42· 6H2O. Tobermorite occurs as snow-white hemispherical to spherical aggregates up to 1 cm in size, it replaces earlier zeophyllite. It is monoclinic, space group Bm, with unit-cell parameters refined from PXRD: a 6.714(4), b 17.375(4), c 22.670(8) Å, γ 123.31(3)° and V 938.2(1.3) Å3. On the base of chemical analyses, tobermorite with empirical formula (Ca4.55Na0.03K0.02)Σ4.60(Si5.40Al0.60)Σ6.00O15.56(OH)1.44·5H2O is accompanied by more rare Ca-poor kenotobermorite with empirical formula (Ca3.99Na0.04)Σ4.03(Si5.60Al0.40)Σ6.00O14.62(OH)2.38·5H2O. Fluorapophyllite-(K) forms abundant prismatic crystals up to 0.5 - 2 cm in size. It is colorless to white with vitreous to greasy lustre. It is tetragonal, space group P4/mnc, with unit-cell parameters refined from PXRD: a 9.0157(13), c 15.7889(19) Å and V = 1283.4(3) Å3. Chemical analyses of fluorapophyllite-(K) correspond to the empirical formula (K0.81Na0.24)Σ1.05Ca4.06(Si7.25Al0.47)Σ8.00O20F1.05· 8H2O. Other zeolites, thomsonite-Ca, chabazite-Ca, phillipsite-Ca and -K, were found in association; their PXRD data, unit-cell parameters and chemical compositions are given in the paper.
在捷克共和国位于Cvikov东北1.5 km， Česká Lípa、Lužické hory山脉东北13 km的Křížový vrch山西坡(a.s.l 443 m)小废弃采石场的新生代玄武岩岩洞中发现了沸石、钙辉石、钙辉石、氟辉石-(K)及其伴生沸石。沸石形成无色球形聚集体，具有珍珠般的光泽，通常大小为3 - 4毫米，很少观察到直径达1厘米的聚集体。它是三角形的，空间群R-3，其单位胞参数由PXRD细化:a 9.362(2)， c 36.470(12) Å和V = 2768.3(1.2) Å3。分子式为(Ca12.84Na0.07)Σ12.91(Si9.83Al0.26)Σ10.09 O28(OH)1.43 F8.42·6H2O。托贝莫里石以白色的半球形或球形聚集体出现，大小可达1厘米，它取代了早期的沸石。它是单斜的，空间群Bm，其单位胞参数由PXRD改进:a 6.714(4)， b 17.375(4)， c 22.670(8) Å， γ 123.31(3)°和V 938.2(1.3) Å3。化学分析表明，经验式为(Ca4.55Na0.03K0.02)Σ4.60(Si5.40Al0.60)Σ6.00O15.56(OH)1.44·5H2O的托伯莫里石与经验式为(Ca3.99Na0.04)Σ4.03(Si5.60Al0.40)Σ6.00O14.62(OH)2.38·5H2O的贫钙基诺托伯莫里石相结合。氟磷灰石-(K)形成丰富的棱柱状晶体，大小可达0.5 - 2厘米。无色至白色，具有玻璃状至油腻状光泽。它是四边形的，空间群为P4/mnc，其单胞参数由PXRD得到:a为9.0157(13)，c为15.7889(19)Å， V = 1283.4(3) Å3。氟泡石-(K)的化学分析对应于实验式(K0.81Na0.24)Σ1.05Ca4.06(Si7.25Al0.47)Σ8.00O20F1.05·8H2O。伴生沸石有钙方石、钙方石、钙方石和钾方石;文中给出了它们的PXRD数据、单胞参数和化学成分。
{"title":"Zeofylit, tobermorit, fluorapofylit-(K) a doprovodná zeolitová mineralizace z Křížového vrchu u Cvikova \u0000v Lužických horách (Česká republika)","authors":"P. Pauliš, Libor Hrůzek, J. Sejkora, Oldřich Janeček, Ondřej Pour, Bohuslav Bureš, Blanka Šreinová","doi":"10.46861/bmp.31.065","DOIUrl":"https://doi.org/10.46861/bmp.31.065","url":null,"abstract":"Zeophyllite, tobermorite, kenotobermorite, fluorapophylite-(K) and associated zeolites were found in cavities of Cenozoic basaltic rocks of small abandoned quarry at western slope of the Křížový vrch hill (443 m a.s.l.), 1.5 km NE from Cvikov, 13 km NNE from Česká Lípa, Lužické hory Mountains, Czech Republic. Zeophyllite forms colorless spherical aggregates with pearly lustre usually 3 - 4 mm in size, aggregates with diameter up to 1 cm were observed only rarely. It is trigonal, space group R-3, with unit-cell parameters refined from PXRD: a 9.362(2), c 36.470(12) Å and V = 2768.3(1.2) Å3. Chemical analyses of zeophyllite correspond to the empirical formula (Ca12.84Na0.07)Σ12.91(Si9.83Al0.26)Σ10.09 O28(OH)1.43 F8.42· 6H2O. Tobermorite occurs as snow-white hemispherical to spherical aggregates up to 1 cm in size, it replaces earlier zeophyllite. It is monoclinic, space group Bm, with unit-cell parameters refined from PXRD: a 6.714(4), b 17.375(4), c 22.670(8) Å, γ 123.31(3)° and V 938.2(1.3) Å3. On the base of chemical analyses, tobermorite with empirical formula (Ca4.55Na0.03K0.02)Σ4.60(Si5.40Al0.60)Σ6.00O15.56(OH)1.44·5H2O is accompanied by more rare Ca-poor kenotobermorite with empirical formula (Ca3.99Na0.04)Σ4.03(Si5.60Al0.40)Σ6.00O14.62(OH)2.38·5H2O. Fluorapophyllite-(K) forms abundant prismatic crystals up to 0.5 - 2 cm in size. It is colorless to white with vitreous to greasy lustre. It is tetragonal, space group P4/mnc, with unit-cell parameters refined from PXRD: a 9.0157(13), c 15.7889(19) Å and V = 1283.4(3) Å3. Chemical analyses of fluorapophyllite-(K) correspond to the empirical formula (K0.81Na0.24)Σ1.05Ca4.06(Si7.25Al0.47)Σ8.00O20F1.05· 8H2O. Other zeolites, thomsonite-Ca, chabazite-Ca, phillipsite-Ca and -K, were found in association; their PXRD data, unit-cell parameters and chemical compositions are given in the paper.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Sejkora, P. Škácha, L. Vrtiška, Z. Dolníček, Jaroslav Jindra
Rare sulphate of nickel, retgersite, was identified on the one specimen collected on the dump of the Lill shaft, Březové Hory ore district, Příbram (Czech Republic) in 1990s. The specimen consists of quartz gangue with dominant millerite and sphalerite. Retgersite forms light blue to blue-green curved fibrous microcrystalline aggregates up to 2 mm in size with vitreous lustre, growing on the surface and in small outer vugs of the supergene altered gangue. Retgersite was identified by PXRD and its refined unit-cell parameters (for the tetragonal space group P41212) are: a 6.7838(2) Å, c 18.2951(8) Å and V 841.94(4) Å3. Results of semiquantitative chemical analysis (EDS) as well as vibrational spectra (Raman, infrared) including their tentative assignments are also given. The studied retgersite was formed by (sub)recent weathering of primary nickel mineralisation (mostly millerite) in the mine dump conditions.
1990年代，在Příbram(捷克共和国)Březové Hory矿区的Lill竖井的垃圾场收集的一个样本上发现了稀有的镍硫酸盐，retgersite。样品由石英脉石组成，以针闪石和闪锌矿为主。辉石形成浅蓝色到蓝绿色的弯曲纤维状微晶集合体，大小可达2毫米，具有玻璃质光泽，生长在表生蚀变脉石的表面和小的外部孔洞中。通过PXRD对Retgersite进行了鉴定，其精化单晶胞参数为:a 6.7838(2) Å， c 18.2951(8) Å， V 841.94(4) Å3。给出了半定量化学分析(EDS)和振动光谱(拉曼光谱、红外光谱)的结果及其初步归属。所研究的辉石是在矿山排土场条件下由原生镍矿化(主要是针勒石)(亚)近代风化作用形成的。
{"title":"Retgersite from mine dump of the Lill shaft, Březové Hory ore district, Příbram (Czech Republic)","authors":"J. Sejkora, P. Škácha, L. Vrtiška, Z. Dolníček, Jaroslav Jindra","doi":"10.46861/bmp.31.089","DOIUrl":"https://doi.org/10.46861/bmp.31.089","url":null,"abstract":"Rare sulphate of nickel, retgersite, was identified on the one specimen collected on the dump of the Lill shaft, Březové Hory ore district, Příbram (Czech Republic) in 1990s. The specimen consists of quartz gangue with dominant millerite and sphalerite. Retgersite forms light blue to blue-green curved fibrous microcrystalline aggregates up to 2 mm in size with vitreous lustre, growing on the surface and in small outer vugs of the supergene altered gangue. Retgersite was identified by PXRD and its refined unit-cell parameters (for the tetragonal space group P41212) are: a 6.7838(2) Å, c 18.2951(8) Å and V 841.94(4) Å3. Results of semiquantitative chemical analysis (EDS) as well as vibrational spectra (Raman, infrared) including their tentative assignments are also given. The studied retgersite was formed by (sub)recent weathering of primary nickel mineralisation (mostly millerite) in the mine dump conditions.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Sejkora, Petr Pauliš, L. Vrtiška, O. Pour, Z. Dvořák
A very rare mineral lindgrenite, Cu3(MoO4)2(OH)2, was found in material from the 3rd level of abandoned Cínovec mine 1 of the Cínovec Sn-W deposit, Krušné hory Mountains, northern Bohemia. This is the first occurrence of this mineral in the Czech Republic. Lindgrenite occurs there as olive green irregular coatings on the area up to 0.5 × 1 cm in size formed by hemispherical to spherical aggregates up to 0.3 mm across with crystalline surface in association with brochantite. Lindgrenite is monoclinic, space group P21/n, the unit-cell parameters refined from X-ray powder diffraction data are: a 5.3934(18), b 14.032(2), c 5.6098(15) Å, β 98.54(2)° and V 419.86(16) Å3. Chemical analyses of lindgrenite correspond to the empirical formula (Cu2.92Fe0.03)Σ2.95(MoO4)1.97(PO4)0.07(AsO4)0.01(OH)1.70 on the basis of 5 atoms pfu. Its origin is connected with simultaneous weathering of primary Cu (tennantite) and Mo (molybdenite) minerals in the conditions of supergene zone in-situ.
在波希米亚北部Krušné hory山Cínovec锡钨矿床废弃的Cínovec 1矿3层的材料中发现了一种非常罕见的菱辉石Cu3(MoO4)2(OH)2。这是捷克共和国首次发现这种矿物。菱辉石以橄榄绿色不规则涂层出现在面积达0.5 × 1厘米的区域，由直径达0.3毫米的半球形或球形聚集体形成，晶体表面与钙辉石相结合。Lindgrenite为单斜晶，空间群P21/n, x射线粉末衍射数据精化的晶胞参数为:a 5.3934(18)， b 14.032(2)， c 5.6098(15) Å， β 98.54(2)°和V 419.86(16) Å3。基于5个原子的pfu，对菱辉石的化学分析符合实验式(cu2.92 2fe0.03)Σ2.95(MoO4)1.97(PO4)0.07(AsO4)0.01(OH)1.70。其成因与原生Cu (tentenites)和Mo(辉钼矿)在地表生带条件下同时风化有关。
{"title":"Lindgrenite, monoclinic Cu3(MoO4)(OH)2, from Cínovec, Krušné hory Mountains - the first occurrence \u0000in the Czech Republic","authors":"J. Sejkora, Petr Pauliš, L. Vrtiška, O. Pour, Z. Dvořák","doi":"10.46861/bmp.31.041","DOIUrl":"https://doi.org/10.46861/bmp.31.041","url":null,"abstract":"A very rare mineral lindgrenite, Cu3(MoO4)2(OH)2, was found in material from the 3rd level of abandoned Cínovec mine 1 of the Cínovec Sn-W deposit, Krušné hory Mountains, northern Bohemia. This is the first occurrence of this mineral in the Czech Republic. Lindgrenite occurs there as olive green irregular coatings on the area up to 0.5 × 1 cm in size formed by hemispherical to spherical aggregates up to 0.3 mm across with crystalline surface in association with brochantite. Lindgrenite is monoclinic, space group P21/n, the unit-cell parameters refined from X-ray powder diffraction data are: a 5.3934(18), b 14.032(2), c 5.6098(15) Å, β 98.54(2)° and V 419.86(16) Å3. Chemical analyses of lindgrenite correspond to the empirical formula (Cu2.92Fe0.03)Σ2.95(MoO4)1.97(PO4)0.07(AsO4)0.01(OH)1.70 on the basis of 5 atoms pfu. Its origin is connected with simultaneous weathering of primary Cu (tennantite) and Mo (molybdenite) minerals in the conditions of supergene zone in-situ.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The amphibolites from the Strážov Moldanubian unit in western part of the Bohemian Massif form intercalations in metasediments of this geological unit. The Strážov Moldanubian unit forms the westernmost occurrence of Variegated group of the Moldanubian Zone. These amphibolites occur as intercalations of very different size in biotite-sillimanite, partly migmatitized paragneisses. The amphibolites were sampled in two abandoned quarries near the Svatá Kateřina and Běšiny. According to their modal composition the amphibolites occurring in quarry Radošín, near the Svatá Kateřina village, are plagioclase-bearing amphibolites with very high differences in amphibole and plagioclase ratio. The garnet is significant minor component of some amphibolites. The amphibolites occurring near of the Běšiny village form very thin, relatively long lenses as part of calc-silicate-amphibolite stromatites occurring in the central part of the Strážov Moldanubian unit. The both amphibolites are probably a metamorphic equivalent of tholeiitic volcanic rocks with tectonomagmatic features of the middle ocean ridge basalts (MORB).
{"title":"Petrografie a geochemie amfibolitů strážovského moldanubika","authors":"M. René","doi":"10.46861/bmp.31.035","DOIUrl":"https://doi.org/10.46861/bmp.31.035","url":null,"abstract":"The amphibolites from the Strážov Moldanubian unit in western part of the Bohemian Massif form intercalations in metasediments of this geological unit. The Strážov Moldanubian unit forms the westernmost occurrence of Variegated group of the Moldanubian Zone. These amphibolites occur as intercalations of very different size in biotite-sillimanite, partly migmatitized paragneisses. The amphibolites were sampled in two abandoned quarries near the Svatá Kateřina and Běšiny. According to their modal composition the amphibolites occurring in quarry Radošín, near the Svatá Kateřina village, are plagioclase-bearing amphibolites with very high differences in amphibole and plagioclase ratio. The garnet is significant minor component of some amphibolites. The amphibolites occurring near of the Běšiny village form very thin, relatively long lenses as part of calc-silicate-amphibolite stromatites occurring in the central part of the Strážov Moldanubian unit. The both amphibolites are probably a metamorphic equivalent of tholeiitic volcanic rocks with tectonomagmatic features of the middle ocean ridge basalts (MORB).","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dalibor Velebil, Jaroslav Hyršl, J. Sejkora, Z. Dolníček
The quantitative study of chemical composition of ten samples of the tetrahedrite group minerals from six deposits in Bolivia (Animas - Chocaya, Pulacayo, San Vicente, Machacamarca, Cerro Rico, Oruro) provided new data enabling their detailed classification within this group. The majority of samples are usual members of tetrahedrite group: tennantite-(Zn) (San Vicente, Oruro), tetrahedrite-(Zn) (Animas - Chocaya, Pulacayo, San Vicente, Cerro Rico, Oruro) and tetrahedrite-(Fe) (Pulacayo, Machacamarca, Cerro Rico). The recently redefined members of this group - argentotetrahedrite-(Fe) and kenoargentotetrahedrite-(Fe) were found in samples from Cerro Rico and Animas - Chocaya deposits, respectively. The descriptions and quantitative EPMA data for all studied samples are given in the paper.
{"title":"Chemismus a klasifikace minerálů skupiny tetraedritu z ložisek v Bolívii","authors":"Dalibor Velebil, Jaroslav Hyršl, J. Sejkora, Z. Dolníček","doi":"10.46861/bmp.31.082","DOIUrl":"https://doi.org/10.46861/bmp.31.082","url":null,"abstract":"The quantitative study of chemical composition of ten samples of the tetrahedrite group minerals from six deposits in Bolivia (Animas - Chocaya, Pulacayo, San Vicente, Machacamarca, Cerro Rico, Oruro) provided new data enabling their detailed classification within this group. The majority of samples are usual members of tetrahedrite group: tennantite-(Zn) (San Vicente, Oruro), tetrahedrite-(Zn) (Animas - Chocaya, Pulacayo, San Vicente, Cerro Rico, Oruro) and tetrahedrite-(Fe) (Pulacayo, Machacamarca, Cerro Rico). The recently redefined members of this group - argentotetrahedrite-(Fe) and kenoargentotetrahedrite-(Fe) were found in samples from Cerro Rico and Animas - Chocaya deposits, respectively. The descriptions and quantitative EPMA data for all studied samples are given in the paper.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：