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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：Charleshatchettite，CaNb4O10（OH）（2）中心点8H（2）O，是一种新矿物，与方沸石和方解石有关，发现于加拿大魁北克省圣希莱尔山霞石正长岩的断裂面上。该矿物以白色球状体（直径类似于0.15-0.20 mm）形式存在，由辐射晶体组成，单个晶体的平均尺寸类似于0.002 x 0.010 x 0.040 mm。晶体是自形的，叶片状（在[100]上变平），透明到半透明。该矿物与钠长石、石英、白云母、磁黄铁矿、黄铁矿、方解石（Ce）和菱铁矿伴生。根据推断，辉石为双轴（-），α′=类似于1.72（2），γ′=类似于1.82（2）。化学分析数据（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）和H2O（calc）22.96，总重量百分比给出了平均经验公式：（Ca1.00Mg0.04）（Sigma 1.04）（Nb3.62Ti0.32Si0.12Al0.12Al0.08）基于Sigma（8H2O）中心的阴离子（10.08）。这与hochelagaite（CaNb4O11中心点nH（2）O）相似，尽管二者很容易通过粉末X射线衍射图进行区分。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，空间群C2/c（第15位）。晶体结构细化至R=5.64%，包含1个Ca位、2个畸变八面体Nb位和10个O位。它由四个边共享Nb（O，OH）（6）八面体的簇组成，通过共享角连接到相邻簇，形成Nb（O，OH）（6）八面体层。它们沿着[100]交替排列，层由Ca（H2O）（8）多面体组成，二者通过氢键连接在一起。Charleshatchettite是一种晚期矿物，被认为是通过低T（<150℃）水溶液与一种富碱、富铌的前体在轻微温度下相互作用而形成的

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