褐铁矿-(La)， LaFe3+3(AsO4)2(OH)6，是摩洛哥Bou Skour矿区Patte d'Oie矿明矾石超群的新成员

IF 1.8 3区地球科学 Q2 MINERALOGY European Journal of Mineralogy Pub Date : 2022-06-27 DOI:10.5194/ejm-34-365-2022

C. Biagioni, M. Ciriotti, G. Favreau, D. Mauro, F. Zaccarini

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引用次数: 1

摘要

摘要在摩洛哥Bou Skour矿区的Patte d'Oie矿中发现了一种新的矿物——水滑石-（La），即LaFe33+（AsO4）2（OH）6。它以黄色菱形晶体的形式出现，最高可达0.1 mm，具有树脂光泽，与孔雀石、玛瑙石-（La）、分生孢子石和一种尚未确定的REE碳酸盐有关。晶体被化学分区，并鉴定出两个均匀的结构域，对应于经验化学式（基于每个化学式单元6个阳离子计算，假设存在14个O原子）（La0.34Ce0.20Ca0.11Sr0.07Pb0.05K0.04）∑0.81（Fe2.163+Al0.84Cu0.20）∑3.20（As1.23P30.39S0.37）∑1.99O14H6.13（结构域#1）和（La0.38Ce0.22Sr0.10Ca0.09Pb0.05K0.06）∑0.90（Fe2.603+Al0.49Cu0.20）σ3.29（As0.91P0.50S0.40）∑1.81O14H6.53（结构域#2）。单晶晶胞参数为a=7.252（13），c=16.77（3） Å，V=764（3） Å3，空间群R-3m。在观察到的X射线粉末衍射图中的八个强反射是（d inÅ，视觉估计的强度）：5.86，中等；3.045，强；2.511，中等偏弱；2.239，中等；1.960，中等偏弱；1.813，中等偏弱；1.689，中等偏弱；1.478，中等。Graulichite-（La）属于明矾石超群中的暗长石组。它是绿柱石-（Ce）的La类似物，也是砷黄铁矿-（La）的Fe3+类似物。

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Graulichite-(La), LaFe³⁺₃(AsO₄)₂(OH)₆, a new addition to the alunite supergroup from the Patte d'Oie mine, Bou Skour mining district, Morocco

Abstract. The new mineral species graulichite-(La), ideally LaFe33+(AsO4)2(OH)6, has been discovered in the Patte d'Oie mine, Bou Skour mining district, Morocco. It occurs as yellow rhombohedral crystals, up to 0.1 mm in size, with a resinous luster, associated with malachite, agardite-(La), conichalcite, and a still undetermined REE carbonate. Crystals are chemically zoned and two homogeneous domains were identified, corresponding to the empirical chemical formulae (calculated on the basis of 6 cations per formula unit, assuming the occurrence of 14 O atoms) (La0.34Ce0.20Ca0.11Sr0.07Pb0.05K0.04)Σ0.81(Fe2.163+Al0.84Cu0.20)Σ3.20(As1.23P0.39S0.37)Σ1.99O14H6.13 (domain #1) and (La0.38Ce0.22Sr0.10Ca0.09Pb0.05K0.06)Σ0.90(Fe2.603+Al0.49Cu0.20)Σ3.29(As0.91P0.50S0.40)Σ1.81O14H6.53 (domain #2). Single-crystal unit-cell parameters are a=7.252(13), c=16.77(3) Å, V=764(3) Å3, space group R-3m. The eight strongest reflections in the observed X-ray powder diffraction pattern are (d in Å, visually estimated intensity): 5.86, medium; 3.045, strong; 2.511, medium-weak; 2.239, medium; 1.960, medium-weak; 1.813, medium-weak; 1.689, medium-weak; 1.478, medium. Graulichite-(La) belongs to the dussertite group within the alunite supergroup. It is the La analogue of graulichite-(Ce) and the Fe3+ analogue of arsenoflorencite-(La).

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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.