New secondary phosphate mineral occurrences and their crystal chemistry, at the Hagendorf Süd pegmatite, Bavaria

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2022-10-10 DOI:10.5194/ejm-34-439-2022

E. Keck, I. Grey, C. MacRae, Stephanie Boer, R. Hochleitner, Christian Rewitzer, W. G. Mumme, A. Glenn, C. Davidson

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引用次数: 1

Abstract

Abstract. First occurrences from the Hagendorf Süd pegmatite of the secondary phosphate minerals kenngottite, Mn32+Fe43+(PO4)4(OH)6(H2O)2; allanpringite, Fe33+(PO4)2(OH)3 ⚫ 5H2O; iangreyite, Ca2Al7(PO4)2(PO3OH)2(OH,F)15 ⚫ 8H2O; and nizamoffite, MnZn2(PO4)2(H2O)4, are reported with characterisation of their crystal chemistry and phase associations. A synchrotron single-crystal structure refinement for kenngottite shows that it has the same level of disordering (75 %/25 %) of Fe3+ in adjacent octahedra along the 5 Å axis as for type-locality kenngottite from Krásno, Czech Republic. This is explained in terms of 1 : 1 fine-scale mixing of domains of ordered kenngottite-type and souzalite-type structures. Allanpringite occurs in an unusual epitaxial relationship to associated strunzite. The epitaxy is explained by the close metrical and structural match of common planes in the two minerals, (010) for allanpringite and (100) for strunzite. Iangreyite occurs in close association with perhamite in 30 µm spheroids. The characterisation results support a paragenesis of iangreyite from perhamite by selective leaching of silica from the layer structure of perhamite and rejoining of the layers by fusion of AlO4 tetrahedra from adjacent layers into AlO2(OH)3 trigonal bipyramids.

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巴伐利亚Hagendorf Süd伟晶岩中新的次生磷酸盐矿点及其晶体化学

摘要Hagendorf Süd伟晶岩中首次出现的次生磷酸盐矿物kenngottite，Mn32+Fe43+（PO4）4（OH）6（H2O）2；褐帘石，Fe33+（PO4）2（OH）3 ⚫ 5H2O；钙灰岩，Ca2Al7（PO4）2（PO3OH）2（OH，F）15 ⚫ 8h；和nizamoffite，MnZn2（PO4）2（H2O）4，报道了它们的晶体化学和相缔合的表征。同步加速器单晶结构精细化的叉枝晶石表明它具有相同程度的无序化（75 %/25 %)Fe3+在沿5 Å轴为捷克共和国克拉斯诺的kenngottite二型位置。这是用1来解释的 : 1有序kenngottite型和苏杂岩型结构域的精细尺度混合。阿兰绿泥石与伴生的结构石具有不寻常的外延关系。通过两种矿物（010）中的共同平面的紧密测量和结构匹配来解释外延，（010）为尿囊石，（100）为结构石。英绿柱石与全绿柱石密切伴生于30 µm球体。表征结果支持通过从全铝石的层结构中选择性地提取二氧化硅，并通过将相邻层的AlO4四面体融合成AlO2（OH）3三角双锥来重新连接层，从而从全铝石中共生天青石。

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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.