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首页> 外文期刊>The American mineralogist >Charleshatchettite, CaNb4O10(OH)(2)center dot 8H(2)O, a new mineral from Mont Saint-Hilaire, Quebec, Canada: Description, crystal-structure determination, and origin
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Charleshatchettite, CaNb4O10(OH)(2)center dot 8H(2)O, a new mineral from Mont Saint-Hilaire, Quebec, Canada: Description, crystal-structure determination, and origin

机译：Charleshatchette，Canb4O10（OH）（2）Center Dot 8H（2）O是来自Cont Saint-HiLaire，魁北克，加拿大的新型矿物质：描述，晶体结构测定和起源

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摘要

Charleshatchettite, CaNb4O10(OH)(2)center dot 8H(2)O, is a new mineral related to franconite and hochelagaite, discovered on a fracture surface of a nepheline syenite at Mont Saint-Hilaire, Quebec, Canada. The mineral occurs in white globules (similar to 0.15-0.20 mm in diameter) composed of radiating crystals with individual crystals having average dimensions of similar to 0.002 x 0.010 x 0.040 mm. Crystals are euhedral, bladed (flattened on [100]), and are transparent to translucent. The mineral is associated with albite, quartz, muscovite, pyrrhotite, pyrite, ancylite-(Ce), and siderite. Charleshatchettite is inferred to be biaxial (-) with alpha' = similar to 1.72(2) and gamma' = similar to 1.82(2). Data from chemical analyses (SEM-EDS, n = 8): CaO 7.96 (7.04-8.63), MgO 0.24 (0.08-0.78), Al2O3 0.13 (b.d.-0.49), SiO2 1.04 (0.49-1.88), TiO2 3.64 (2.45-5.05), Nb2O5 68.07 (64.83-71.01), and H2O (calc) 22.96, total 104.04 wt% gives the average empirical formula: (Ca1.00Mg0.04)(Sigma 1.04)(Nb3.62Ti0.32Si0.12Al0.02)(Sigma 4.08)O-10(OH)(2)center dot 8H(2)O (based on 20 anions). This is similar to that of hochelagaite (CaNb4O11 center dot nH(2)O), although the two are readily distinguished by their powder X-ray diffraction patterns. Results from single-crystal X-ray diffraction analysis give a = 21.151(4), b = 6.496(2), c = 12.714(3) angstrom, and beta = 103.958(3)degrees, space group C2/c (no. 15). The crystal structure, refined to R = 5.64%, contains 1 Ca site, 2 distorted octahedral Nb sites, and 10 O sites. It consists of clusters of four edge-sharing Nb(O,OH)(6) octahedra, linked through shared corners to adjacent clusters, forming layers of Nb(O,OH)(6) octahedra. These alternate along [100] with layers composed of Ca(H2O)(8) polyhedra, the two being linked together by H-bonding. Charleshatchettite is a late-stage mineral, interpreted to have developed through the interaction of low-T (<150 degrees C) aqueous fluids with an alkali-, Nb-rich precursor under slightly
机译：Charleshatchette，Canb4O10（OH）（2）中心DOT 8H（2）O是与Franconite和Hochelagaite相关的新型矿物，在加拿大魁北克省魁北克省尼北部的尼弗林Syenite的骨折表面上发现。由散热晶体（直径为0.15-0.20mm的0.15-0.20mm）发生矿物，其具有辐射晶体，其各个晶体具有与0.002×0.010×0.040mm的平均尺寸的平均晶体。晶体是Euhedral，Bladed（在[100]上扁平），对半透明透明。矿物质与Albite，石英，Muscovite，Pyrrhotite，黄铁矿，ancylite-（Ce）和散氏菌有关。推断Charleshatchette是双轴（ - ）的α'=类似于1.72（2）和γ'=类似于1.82（2）。来自化学分析的数据（SEM-EDS，N = 8）：CAO 7.96（7.04-8.63），MgO 0.24（0.08-0.78），Al2O3 0.13（BD-0.49），SiO2 1.04（0.49-1.88），TiO2 3.64（2.45 -5.05），Nb2O5 68.07（64.83-71.01）和H2O（Calc）22.96，总数104.04wt％给出了平均经验公式：（Ca1.00mg0.04）（Sigma 1.04）（Nb3.62ti0.32si0.12al0.02 ）（Sigma 4.08）O-10（OH）（2）中心点8H（2）O（基于20个阴离子）。这类似于Hochelagaite（Canb4O11中心点NH（2）O）的类似，尽管两者通过其粉末X射线衍射图案容易区分。单晶X射线衍射分析的结果给出A = 21.151（4），B = 6.496（2），C = 12.714（3）埃，β= 103.958（3）度，空间组C2 / C（NO。 15）。晶体结构，精制到r = 5.64％，含有1个Ca位点，2个扭曲的八面体NB位点和10个O位点。它由四个边缘共享NB（O，OH）（6）八面体的簇组成，通过共用角连接到相邻的簇，形成Nb（O，OH）（6）八面叶的层。这些沿[100]替代，其中由Ca（H 2 O）（8）多面体的层组成，两者通过H键合在一起。 Charleshatchette是一种晚期矿物质，解释为通过低T（<150℃）含水流体与略微的碱化的富含前体的相互作用而发展

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