Whiteite-(CaMnFe), a new jahnsite-group mineral from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2023-02-14 DOI:10.5194/ejm-35-95-2023

R. Hochleitner, Christian Rewitzer, I. Grey, W. G. Mumme, C. MacRae, A. R. Kampf, E. Keck, R. Gable, A. Glenn

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Abstract

Abstract. Whiteite-(CaMnFe), CaMn2+Fe22+Al2(PO4)4(OH)2 ⋅ 8H2O, is a new whiteite-subgroup member of the jahnsite group from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany. It was found in vugs in an altered feldspar area of a specimen composed predominantly of rockbridgeite, with hureaulite and relic triphylite. Other associated minerals in small vugs in the specimen were strengite and laueite. Whiteite-(CaMnFe) occurs as sprays and clusters of colourless to pale yellow, rod-like crystals, with diameters of typically 10 to 50 µm and lengths up to ∼ 500 µm. The crystals are flattened on {001} and elongated along [010]. The measured density is 2.80(2) g cm−3. Optically, whiteite-(CaMnFe) crystals are biaxial (+), with α=1.608(3), β=1.612(3), γ=1.624(3) and 2V(meas.) = 59(1)∘. The empirical formula from electron microprobe analyses and structure refinement is (Ca0.70Mn0.30)Mn(Fe1.232+Mn0.49Mg0.29Zn0.06)(Al1.88Fe0.123+)(PO4)3.96(OH)2(H2O)8. Whiteite-(CaMnFe) is monoclinic, P2 /a, a=14.925(5), b=7.0100(14), c=10.053(2) Å, β=111.31(2)∘, V=979.9(4) Å3 and Z=2. The crystal structure was refined using single-crystal data to wRobs=0.052 for 1613 reflections with I>3σ(I). Site occupancy refinements confirm the ordering of dominant Ca, Mn and Fe2+ in the X, M1 and M2 sites, respectively, of the general jahnsite-group formula XM1M22M32(H2O)8(OH)2(PO4)4.

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Whiteite-（CaMnFe），来自巴伐利亚州奥伯普法尔茨Hagendorf-Süd伟晶岩的一种新的jahnsite族矿物

摘要白云石-（CaMnFe），CaMn2+Fe22+Al2（PO4）4（OH）2 ⋅ 8H2O，是德国巴伐利亚州奥伯普法尔茨Hagendorf-Süd伟晶岩中的一个新的白云岩亚群成员。它是在一个主要由岩桥镁石、绿柱石和遗迹三叶石组成的标本的蚀变长石区中发现的。试样中小洞穴中的其他伴生矿物为强铝石和劳埃特。Whiteite-（CaMnFe）以无色至浅黄色棒状晶体的喷雾和簇状出现，直径通常为10至50 µ需求长度可达～ 500 µm。晶体在{001}上变平并沿[010]伸长。测量的密度为2.80（2） g cm−3。在光学上，白云岩-（CaMnFe）晶体是双轴（+）晶体，α=1.608（3），β=1.612（3 = 59（1）∘。电子探针分析和结构细化的经验公式为（Ca0.70Mn0.30）Mn（Fe1.232+Mn0.49Mg0.29Zn0.06）（Al1.88Fe0.123+）（PO4）3.96（OH）2（H2O）8 /a、 a=14.925（5），b=7.0100（14），c=10.053（2） Å，β=111.31（2）∘，V=979.9（4） Å3和Z=2。使用单晶数据对晶体结构进行了细化，对于I>3σ（I）的1613次反射，wRobs=0.052。位点占据细化证实了一般的氮杂石群formulaXM1M22M32（H2O）8（OH）2（PO4）4的X、M1和M2位点中占主导地位的Ca、Mn和Fe2+的顺序。

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来源期刊

European Journal of Mineralogy 地学-矿物学

CiteScore

2.80

自引率

9.50%

发文量

审稿时长

6-12 weeks

期刊介绍： EJM was founded to reach a large audience on an international scale and also for achieving closer cooperation of European countries in the publication of scientific results. The founding societies have set themselves the task of publishing a journal of the highest standard open to all scientists performing mineralogical research in the widest sense of the term, all over the world. Contributions will therefore be published primarily in English. EJM publishes original papers, review articles and letters dealing with the mineralogical sciences s.l., primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, but also biomineralogy, environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.

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