{"title":"Raman spectroscopic measurements on San Carlos olivine up to 14 GPa and 800 K: Implication for thermodynamic properties","authors":"","doi":"10.2138/am-2023-9052","DOIUrl":"https://doi.org/10.2138/am-2023-9052","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"63 7-8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135370606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jeffrey E. Post, Peter J. Heaney, Eugene S. Ilton, Evert J. Elzinga
Abstract Studies suggest that feitknechtite (β-MnOOH) is a prevalent, and perhaps necessary, intermediate phase during the synthesis of birnessite-like phases, the abiotic oxidation of Mn2+, and the transformation of biogenic hexagonal phyllomanganates to more complex Mn oxides in laboratory and natural systems. Researchers have generally described feitknechtite as consisting of pyrochroite-like (or cadmium iodide-like) Mn-O octahedral layers, but a detailed crystal structure has not been reported. We used TEM/SAED and powder XRD and Rietveld refinements to derive the unit cell and, for the first time, report a complete structure description for feitknechtite (β-MnOOH). Rietveld refinements were also completed for three natural feitknechtite/hausmannite samples, and time-resolved synchrotron XRD experiments were used to follow the thermal transformation of feitknechtite to hausmannite. Additionally, we identified and report the structure for a second, and perhaps novel, MnOOH polymorph (proposed designation ε-MnOOH), mixed with the synthetic feitknechtite, that is similar to β-MnOOH but with a different layer stacking.
{"title":"The Crystal Structure of Feitknechtite (β-MnOOH) and a new MnOOH Polymorph","authors":"Jeffrey E. Post, Peter J. Heaney, Eugene S. Ilton, Evert J. Elzinga","doi":"10.2138/am-2022-8729","DOIUrl":"https://doi.org/10.2138/am-2022-8729","url":null,"abstract":"Abstract Studies suggest that feitknechtite (β-MnOOH) is a prevalent, and perhaps necessary, intermediate phase during the synthesis of birnessite-like phases, the abiotic oxidation of Mn2+, and the transformation of biogenic hexagonal phyllomanganates to more complex Mn oxides in laboratory and natural systems. Researchers have generally described feitknechtite as consisting of pyrochroite-like (or cadmium iodide-like) Mn-O octahedral layers, but a detailed crystal structure has not been reported. We used TEM/SAED and powder XRD and Rietveld refinements to derive the unit cell and, for the first time, report a complete structure description for feitknechtite (β-MnOOH). Rietveld refinements were also completed for three natural feitknechtite/hausmannite samples, and time-resolved synchrotron XRD experiments were used to follow the thermal transformation of feitknechtite to hausmannite. Additionally, we identified and report the structure for a second, and perhaps novel, MnOOH polymorph (proposed designation ε-MnOOH), mixed with the synthetic feitknechtite, that is similar to β-MnOOH but with a different layer stacking.","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"178 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136103081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A neutron diffraction study of the hydrous borate inderborite, CaMg[B3O3(OH)5]2(H2O)4·2H2O","authors":"","doi":"10.2138/am-2023-9162","DOIUrl":"https://doi.org/10.2138/am-2023-9162","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"30 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135062274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Magmatic degassing and fluid metasomatism promote compositional variation from I-type to peralkaline A-type granite in late Cretaceous Fuzhou felsic complex, SE China","authors":"","doi":"10.2138/am-2023-8936","DOIUrl":"https://doi.org/10.2138/am-2023-8936","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"30 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135062273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Highlights and Breakthroughs The search for a universal law of crystal growth: The law of proportionate effect?","authors":"","doi":"10.2138/am-2023-9182","DOIUrl":"https://doi.org/10.2138/am-2023-9182","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Machine-learning oxybarometer developed using zircon trace-element chemistry and its applications","authors":"","doi":"10.2138/am-2023-8978","DOIUrl":"https://doi.org/10.2138/am-2023-8978","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46820849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Zhengminghuaite, Cu6Fe3As4S12, a new sulfosalt mineral from the Zimudang Carlin-type gold deposit in southwestern Guizhou, China","authors":"","doi":"10.2138/am-2023-9078","DOIUrl":"https://doi.org/10.2138/am-2023-9078","url":null,"abstract":"","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46082152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
9 The thermoelastic properties and thermal expansion of natural single-crystal zircon without detectable 10 radiation damage were determined in the temperature range between 100 K and 1650 K on five 11 samples from Cambodia, Sri Lanka, and Tanzania. Up to about 1500 K, the results are in excellent 12 agreement and fully reversible. The average adiabatic elastic stiffness coefficients at room temperature 13 in GPa are c 11 = 426.8(6), c 12 = 68.1(4), c 13 = 152.0(4), c 33 = 490.8(9), c 44 = 113.1(2) and c 66 = 49.0(1). 14 Polycrystalline averaging for the aggregate bulk and shear modulus (Voigt-Reuss-Hill average) yield K 15 = 229.3(4) GPa and G = 109.3(1) GPa. From 293 K to 1573 K, the elastic stiffnesses soften almost 16 linearly with the temperature coefficients in MPa/K: d c 11 /d T = -45.36(7), d c 12 /d T = -2.03(7), d c 13 /d T = - 17 9.59(7), d c 33 /d T = -42.85(12), d c 44 /d T = -9.60(3), and d c 66 /d T = -2.19(1). Below room temperature, the 18 behavior of the c ij is non-linear, with decreasing absolute values of the temperature coefficients. Above 19 about 1500 K, a temperature-and time-dependent irreversible elastic stiffening accompanied by an 20 increasing ultrasound dissipation was observed in all samples. These anomalies are interpreted to be the 21 consequence of increased dislocation densities.
9在柬埔寨、斯里兰卡和坦桑尼亚的5个11个样品上，在100 K至1650 K的温度范围内测定了未检测到10辐射损伤的天然单晶锆石的热弹性特性和热膨胀。高达约1500K时，结果具有良好的12一致性和完全可逆性。室温下的平均绝热弹性刚度系数13（GPa）为c 11=426.8（6），c 12=68.1（4），c 13=152.0（4）、c 33=490.8（9）、c 44=113.1（2）和c 66=49.0（1）。14骨料体积和剪切模量的多晶平均值（Voigt-Reuss-Hill平均值）得出K 15=229.3（4）GPa和G=109.3（1）GPa。从293 K到1573 K，弹性刚度几乎线性软化，温度系数以MPa/K为单位：d c 11/d T=-45.36（7），d c 12/d T=-2.03（7）、d c 13/d T=-179.59（7）和d c 33/d T=-42.85（12），d c 44/d T=-9.60（3）和d c 66/d T=-2.19（1）。在室温下，c ij的18行为是非线性的，随着温度系数的绝对值的减小。在19至1500K以上，在所有样品中观察到温度和时间依赖的不可逆弹性硬化，伴随着20增加的超声耗散。这些异常现象被解释为位错密度增加的21个结果。
{"title":"Thermoelastic properties of natural zircon – Part I: Non-metamict zircon","authors":"Marie Münchhalfen, Jürgen Schreuer","doi":"10.2138/am-2023-8986","DOIUrl":"https://doi.org/10.2138/am-2023-8986","url":null,"abstract":"9 The thermoelastic properties and thermal expansion of natural single-crystal zircon without detectable 10 radiation damage were determined in the temperature range between 100 K and 1650 K on five 11 samples from Cambodia, Sri Lanka, and Tanzania. Up to about 1500 K, the results are in excellent 12 agreement and fully reversible. The average adiabatic elastic stiffness coefficients at room temperature 13 in GPa are c 11 = 426.8(6), c 12 = 68.1(4), c 13 = 152.0(4), c 33 = 490.8(9), c 44 = 113.1(2) and c 66 = 49.0(1). 14 Polycrystalline averaging for the aggregate bulk and shear modulus (Voigt-Reuss-Hill average) yield K 15 = 229.3(4) GPa and G = 109.3(1) GPa. From 293 K to 1573 K, the elastic stiffnesses soften almost 16 linearly with the temperature coefficients in MPa/K: d c 11 /d T = -45.36(7), d c 12 /d T = -2.03(7), d c 13 /d T = - 17 9.59(7), d c 33 /d T = -42.85(12), d c 44 /d T = -9.60(3), and d c 66 /d T = -2.19(1). Below room temperature, the 18 behavior of the c ij is non-linear, with decreasing absolute values of the temperature coefficients. Above 19 about 1500 K, a temperature-and time-dependent irreversible elastic stiffening accompanied by an 20 increasing ultrasound dissipation was observed in all samples. These anomalies are interpreted to be the 21 consequence of increased dislocation densities.","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48501329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.2138/am-2023-nmn108106
Aaron J. Celestian
Abstract This issue of New Mineral Names summarizes new species that contain toxic heavy metals and rare earth elements with a partial focus on new minerals found in China. All these new minerals have potential uses for environmental and technological applications, and their origins reflect historical mining or cultural significance. Here we look at fluorbritholite-(Nd), napoliite, scenicite, evseeite, haitaite-(La), dongchuanite, liguowuite, and gysinite-(La).
{"title":"New Mineral Names: Heavy metal and minerals from China","authors":"Aaron J. Celestian","doi":"10.2138/am-2023-nmn108106","DOIUrl":"https://doi.org/10.2138/am-2023-nmn108106","url":null,"abstract":"Abstract This issue of New Mineral Names summarizes new species that contain toxic heavy metals and rare earth elements with a partial focus on new minerals found in China. All these new minerals have potential uses for environmental and technological applications, and their origins reflect historical mining or cultural significance. Here we look at fluorbritholite-(Nd), napoliite, scenicite, evseeite, haitaite-(La), dongchuanite, liguowuite, and gysinite-(La).","PeriodicalId":7768,"journal":{"name":"American Mineralogist","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135458453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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