[Chemical composition] composition with pyrite, pyrite polymorph each other like variants. Contains trace amounts of As, Sb, Bi, Co, Cu and other mixed substances.
[Crystal structure] orthorhombic system; 
a 0 = 0.338 nm, b 0 = 0.444 nm, c 0 = 0.539 nm; Z = 2. The crystal structure is characterized by Fe 2+ located at the top and center of the orthorhombic unit cell, the axis of the dumbbell [S 2 ] 2- is oblique to the c-axis, and its two ends are located at two triangles surrounded by Fe 2+ center of. Although the pyrite and pyrite have the exact same coordination relationship, the degree of symmetry of the crystal structure is completely different, which is caused by the difference in the shape of the dumbbell-shaped [S 2 ] 2- axial orientation (Fig. L-29). .
Figure L-29 Crystal structure of pyrite
(quoted from Pan Zhaoyu et al., 1993)
[Form] The single crystal is plate-shaped and sometimes has a spear-shaped crystal shape. Chang Chengyi {110}'s cockscomb repeated double crystal. It is usually produced in the form of tuberculous hulls.
[Physical properties] copper color and slightly yellowish light green or light gray color, fresh surface nearly white tin (coloration than pyrite) dark green streaks; opaque, metallic luster. No clerk. Hardness 5 to 6.5. The relative density is 4.05 to 4.9. Crisp. Weak conductivity.
[genesis and occurrence] The distribution of pyrite in the natural world is much less than that of pyrite, and does not form a large amount of accumulation. It is an unstable variant of Fe[S 2 ] which is converted to pyrite above 350 °C. The pyrite produced by the external formation is mainly found in carbonaceous sand shale and appears as tuberculosis. Under oxidizing conditions, the pyrite is easily decomposed to form iron sulfates and hydroxides.
[Identification characteristics] Pyrite is similar to pyrite. When the crystal form is intact, it can be distinguished according to crystal form and color. Fine particle size is determined by X-ray powder crystal method.
[Main use] The same is true for pyrite.
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