Crystal structure of holtite II

Zubkova NV; Pushcharovskii DY; Kabalov YK; Kazantsev SS; Voloshin AV

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Crystal structure of holtite II

机译：白云母II的晶体结构

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The crystal structure of the As-containing mineral holtite II was refined by the Rietveld method. The orthorhombic unit-cell parameters are a = 4.6893(1) angstrom, b = 11.881(1) angstrom, c = 20.394(1) angstrom, sp. gr. Pnma, Z = 4. Holtite II has an octahedral framework structure composed of two types of nonequivalent columns of Al octahedra, which was found in the structures of dumortierite-group minerals and holtite I. The differences in the structures of holtite II and holtite I were revealed. These differences are associated with the differences in the composition and configuration of the columns of Al(1) polyhedra, which are located inside the framework and are linked to SiO4 tetrahedra, as well as with the arrangement of pyramidal SbO3 groups.

机译：通过Rietveld方法精制含As的矿物辉石II的晶体结构。斜方晶胞参数是a = 4.6893（1）埃，b = 11.881（1）埃，c = 20.394（1）埃，sp。 gr。 Pnma，Z =4。辉铁矿II具有八面体骨架结构，由八种八面体的非等价柱组成，这是在硬蒙脱石族矿物和辉石I的结构中发现的。辉石II和辉石I的结构差异被揭示。这些差异与位于框架内部并与SiO4四面体相连的Al（1）多面体的列的组成和构型的差异以及金字塔形SbO3基团的排列有关。

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来源
《Crystallography reports》 |2006年第1期|共7页
作者
Zubkova NV; Pushcharovskii DY; Kabalov YK; Kazantsev SS; Voloshin AV;
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正文语种 eng
中图分类晶体学;
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PHOSPHITES; CHEMISTRY;

机译：磷酸盐;化学;

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Crystal structure of holtite II

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