Guérinite Ca6(HAsO4)3(AsO4)2∙10.5H2O – a revision of the mineral formula

IF 1.4 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Mineralogy and Petrology Pub Date : 2024-10-07 DOI:10.1007/s00710-024-00873-2

Irene Liebhart, Branko Rieck, Gerald Giester

引用次数: 0

Abstract

A single crystal of guérinite from the Plaka Mine, Lavrion, Greece, was examined by X-ray diffraction. The mineral crystallizes in the monoclinic space group P2₁/n with unit cell parameters a = 17.628 (2), b = 6.728 (1), c = 23.384 (3) Å, β = 90.68 (1)°, V = 2773.4 (6) Å³. The originally reported mineral formula Ca₅(HAsO₄)₂(AsO₄)₂∙9H₂O, Z = 5 should be revised to Ca₆(HAsO₄)₃(AsO₄)₂∙10.5H₂O, Z = 4. Accordingly, guérinite is no longer considered a polymorph to ferrarisite. The structure is characterized by complex layers consisting of corner- and edge sharing of CaO_n (n = 7, 8) polyhedra and arsenate groups. The connection between these units is achieved exclusively via hydrogen bonding.

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无规石 Ca6(HAsO4)3(AsO4)2∙10.5H2O - 对矿物公式的修订

通过 X 射线衍射研究了希腊拉夫里翁普拉卡矿出产的圭尔特石单晶体。该矿物结晶为单斜空间群 P21/n，单胞参数 a = 17.628 (2)，b = 6.728 (1)，c = 23.384 (3) Å，β = 90.68 (1)°，V = 2773.4 (6) Å3。最初报告的矿物公式 Ca5(HAsO4)2(AsO4)2∙9H2O, Z = 5 应修改为 Ca6(HAsO4)3(AsO4)2∙10.5H2O, Z = 4。因此，guérinite 不再被视为铁素体的多晶体。其结构的特点是由 CaOn（n = 7、8）多面体和砷酸盐基团的角共用和边共用组成的复杂层。这些单元之间的连接完全通过氢键实现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Mineralogy and Petrology 地学-地球化学与地球物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： Mineralogy and Petrology welcomes manuscripts from the classical fields of mineralogy, igneous and metamorphic petrology, geochemistry, crystallography, as well as their applications in academic experimentation and research, materials science and engineering, for technology, industry, environment, or society. The journal strongly promotes cross-fertilization among Earth-scientific and applied materials-oriented disciplines. Purely descriptive manuscripts on regional topics will not be considered. Mineralogy and Petrology was founded in 1872 by Gustav Tschermak as "Mineralogische und Petrographische Mittheilungen". It is one of Europe''s oldest geoscience journals. Former editors include outstanding names such as Gustav Tschermak, Friedrich Becke, Felix Machatschki, Josef Zemann, and Eugen F. Stumpfl.