Elongated rhombohedron-shaped crystals of pyrite from the mount Kinzhal (the Northern Caucasus, Russia) have been studied by means of X-ray powder diffraction method, goniometry, optic microscopy (in polarized reflected light). The observed morphology symmetry corresponds to the Curie's principle and supports the old P. V. Eremeev's hypothesis (1887) that a pyrite crystal could obtain the rhombohedrical form due to degeneration of 6, from 12, faces of pentagon-dodecahedron (210). This consept allows to suggest a specific mechanism of the observed symmetry formation, which assumes, by the way, the influence of an electric field while the pyrite crystals growing.
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机译：通过X射线粉末衍射法，测角法，光学显微镜（在偏振反射光下）研究了金扎尔山（俄罗斯北高加索地区）的黄铁矿的细长菱面体形晶体。观察到的形态对称性符合居里原理，并支持旧的P. V. Eremeev的假说（1887年），即黄铁矿晶体由于从五面十二面体的12个面中退化了6个而获得了菱面体形式（210个）。该概念允许提出观察到的对称性形成的具体机理，顺便说一下，该机理假定了在黄铁矿晶体生长时电场的影响。
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