{"title":"Håleniusite-(Ce), CeOF, the Ce Analogue of Håleniusite-(La) from the Água de Pau Volcano, Sãn Miguel Island, Azores District, Portugal","authors":"A. Kampf, Chi Ma, Luigi Chiappino","doi":"10.3749/canmin.2200002","DOIUrl":null,"url":null,"abstract":"\n Håleniusite-(Ce) (IMA2021-042), CeOF, is a new mineral discovered in ejectum from the Água de Pau volcano, Sãn Miguel Island, Azores District, Portugal. It occurs as opaque, cream-colored, fine-grained pseudomorphic replacements of hexagonal tablets of bastnäsite-(Ce). It is associated with astrophyllite and fluornatropyrochlore in a matrix composed mainly of albite, quartz, and aegirine. The mineral has a white streak and a calculated density of 5.890 g/cm3 for the empirical formula. The strongest powder diffraction lines are [dobsÅ(Iobs)(hkl)]: 3.247(100)(111), 2.840(31)(200), 2.004(46)(220), and 1.705(42)(311). Electron probe microanalysis provided the empirical formula (Ce0.41La0.21Sm0.15Nd0.04Eu0.03Ca0.02Y0.02Dy0.02Gd0.01)Σ0.91(O0.70F0.30)F1.00. Håleniusite-(Ce) has a fluorite-type structure, space group Fmm, with a = 5.6597(10) Å and V = 181.29(10) Å3 (Z = 4).","PeriodicalId":134244,"journal":{"name":"The Canadian Mineralogist","volume":"95 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2022-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Canadian Mineralogist","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3749/canmin.2200002","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
Håleniusite-(Ce) (IMA2021-042), CeOF, is a new mineral discovered in ejectum from the Água de Pau volcano, Sãn Miguel Island, Azores District, Portugal. It occurs as opaque, cream-colored, fine-grained pseudomorphic replacements of hexagonal tablets of bastnäsite-(Ce). It is associated with astrophyllite and fluornatropyrochlore in a matrix composed mainly of albite, quartz, and aegirine. The mineral has a white streak and a calculated density of 5.890 g/cm3 for the empirical formula. The strongest powder diffraction lines are [dobsÅ(Iobs)(hkl)]: 3.247(100)(111), 2.840(31)(200), 2.004(46)(220), and 1.705(42)(311). Electron probe microanalysis provided the empirical formula (Ce0.41La0.21Sm0.15Nd0.04Eu0.03Ca0.02Y0.02Dy0.02Gd0.01)Σ0.91(O0.70F0.30)F1.00. Håleniusite-(Ce) has a fluorite-type structure, space group Fmm, with a = 5.6597(10) Å and V = 181.29(10) Å3 (Z = 4).
h leniusite-(Ce)， CeOF，来自葡萄牙亚速尔群岛s n Miguel岛Água de Pau火山的h leniusite-(La)的Ce模拟物
h leniusite-(Ce) (IMA2021-042)， CeOF，是在葡萄牙亚速尔群岛s n Miguel岛Água de Pau火山喷发物中发现的一种新矿物。它是不透明的，米色的，细颗粒的假晶代替bastnäsite-(Ce)的六边形片剂。它与星叶石和氟钠焦绿石伴生在一个主要由钠长石、石英和绿石组成的基质中。该矿物具有白色条纹，经验公式计算密度为5.890 g/cm3。最强的粉末衍射线为[dobsÅ(Iobs)(hkl)]: 3.247(100)(111)、2.840(31)(200)、2.004(46)(220)和1.705(42)(311)。电子探针微量分析得到经验式(Ce0.41La0.21Sm0.15Nd0.04Eu0.03Ca0.02Y0.02Dy0.02Gd0.01)Σ0.91(O0.70F0.30)F1.00。h leniusite-(Ce)具有萤石型结构，空间群Fmm, a = 5.6597(10) Å， V = 181.29(10) Å3 (Z = 4)。
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