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Crystal structures of low-symmetry cancrinite and cancrisilite varieties

机译：低对称铅锌矿和斜硅钙石晶体结构

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摘要

The high-sodium variety of cancrinite [Si6.3Al5.7O24][Na-2(H2O)(2)][Na-5.7(CO3)(0.9)(SO4)(0.1)(H2O)(0.6)] (Kovdor Massif, Kola Peninsula, Russia) and the calcium-containing variety of cancrisilite [Si6.6Al5.4O24][(Na1.2Ca0.4)(H2O)(1.6)][Na-6(CO3)(1.3)(H2O)(1.2)] (Khibiny Massif, Kola Peninsula, Russia) are studied. The trigonal unit cell parameters of the crystal structures under investigation are as follows: a = 12.727(4) a, c = 5.186(2) a, and space group P3 for the former mineral and a = 12.607(4) a, c = 5.111(1) a, and space group P3 for the latter mineral. The reduced symmetry of the new varieties as compared to the symmetry of typical cancrinite and typical cancrisilite is associated with the specific features in the arrangement of the carbonate groups and water molecules in channels. This inference is confirmed by the IR spectroscopic data.
机译：钠钙锰矿[Si6.3Al5.7O24] [Na-2（H2O）（2）] [Na-5.7（CO3）（0.9）（SO4）（0.1）（H2O）（0.6）]的高钠品种（Kovdor Massif（俄罗斯科拉半岛）和含钙硅钙石[Si6.6Al5.4O24] [（Na1.2Ca0.4）（H2O）（1.6）] [Na-6（CO3）（1.3）（H2O） （1.2）]（俄罗斯科拉半岛的Khibiny Massif）被研究。正在研究的晶体结构的三角形晶胞参数如下：a = 12.727（4）a，c = 5.186（2）a，前一种矿物的空间群P3，a = 12.607（4）a，c = 5.111（1）a和后一种矿物的空间群P3。与典型的Cancrinite和典型的Cancrisilite的对称性相比，新品种的对称性降低与通道中碳酸盐基团和水分子排列的特定特征有关。该推断由IR光谱数据证实。

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