[Chemical composition] Generally, its composition varies roughly from FeAs 0.9 S 1.1 to FeAs 1.1 S 0.9 . The conditions of formation can be estimated by using the As/S ratio: the arsenopyrite formed by high temperature is rich in As; the low temperature is rich in S. But at the same time, it is also affected by the pressure, and the pressure increase and the amount of S also increase. In the arsenopyrite component, there is often a Co-type isomorphous substitution Fe, and a trace amount of Bi, Sb, Zn, Se, etc., which are mostly mechanically mixed. [Crystal structure] monoclinic system; [Form] The single crystal is often columnar, with {120} or {110} oblique columns (Fig. L-30), and there are crystal fringes on the cylinder surface. Also developed {101} false oblique square column (please think about why it is called a false oblique square column). Sometimes a contact twin is formed according to (101); an intercalated twin or triple crystal is formed according to (012). Aggregates tend to be granular or densely packed (Figure L-31). Figure L-30 Crystal and twin crystal of arsenopyrite (a), (b), (c) single crystal (cited from Pan Zhaoyu, 1993), (d), (e) twin crystal (according to Zhao Shanrong, produced in the Shuangmiao gold deposit in Zhen'an, Shaanxi, 1997); oblique square column: u{120}, e{011}; false oblique column: n{101}; parallel double-sided: b{010} Figure L-31 Aromatic sand is a short columnar or granular crystal aggregate [Physical properties] tin white to steel gray; surface often with pale yellow ochre; streaks gray; metallic luster, opaque. The cleavage is not complete. Hardness 5.5 to 6. The relative density is 5.9 to 6.29. It is rusted by hammering arsenic and is magnetic after burning. Crisp. [Cause and occurrence] The temperature range of arsenopyrite formation is very large and is widely found in metal deposits. However, it is more common in high temperature and medium temperature hydrothermal deposits. The arsenopyrite is easily decomposed in an oxidizing environment to form a pale yellow or light green stucco Fe[AsO 4 ]·2H 2 O. [Identification features] Tin white, high hardness, hammering garlic odor. Similar marcasite, arsenopyrite but the polishing streaks exploded added HNO 3, then add ammonium molybdenum, ammonium molybdate may be generated bright yellow green precipitate arsenic. [Main use] is the production of ore and arsenic ore minerals. When the composition contains a high Co, it can be comprehensively utilized.
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a 0 = 0.953 nm, b 0 = 0.566 nm, c 0 = 0.643 nm, β = 90°; Z = 8. The crystal structure of white iron ore derived structural type structure, the [S 2] 2- replaced [AsS] marcasite structure becomes i.e. arsenopyrite structure. Note that the arsenopyrite structure is a monoclinic structure of β=90°.
Arsenopyrite
Fe[AsS]