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Related to arsenopyrite: pyrrhotite, molybdenite


(är'sĭnōpī`rīt, ärsĕn`ō–) or


(mĭs`pĭkəl), silver-white to steel-gray mineral with the metallic luster characteristic of a pyritepyrite
or iron pyrites
, pale brass-yellow mineral, the bisulfide of iron, FeS2. It occurs most commonly in crystals (belonging to the isometric system and usually in the form of cubes and pyritohedrons) but is also found in massive, granular, and stalactite
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. It is a sulfarsenide of iron, FeAsS, crystallizing in the orthorhombic system and occurring also in massive form. It is widely distributed and is an important source of arsenic. Often it is found associated with other minerals and ores of lead and tin. Saxony, Sweden, Cornwall, and various parts of the United States have important deposits.



(or mispickel), a mineral belonging to the group of the sulfur-arsenic compounds of iron. The chemical composition is FeAsS. It usually contains admixtures of an isomorphic nature (cobalt, nickel). It forms the series arsenopyrite (up to 3 percent Co)-danaite (up to 12 percent Co)-glaucodot (more than 12 percent Co). The system is mono-clinic (by the latest data, triclinic); it forms pseudorhombic, prismatic, columnar, and needlelike crystals, starlike growths, and columnar and grainy aggregates. Arsenopyrite has a metallic luster, and its color is tin-white. Its hardness on the mineralogical scale is 5.5–6. The density is 5,9000–6,200 kg/m3. When struck, arsenopyrite gives off a sharp odor of garlic. Arsenopyrite is encountered in ore veins together with the sulfides of lead, zinc, and bismuth, as well as with tungsten, cassiterite, gold nuggets, and others. Formation within a wide temperature range is characteristic of arsenopyrite. (It is found in pegmatites and hydrothermal deposits.) Upon being subjected to weathering and oxidation of the surface of the earth, arsenopyrite is transformed into scorodite and other hydrated arsenates of iron. Arsenopyrite is the principal raw material for the extraction of arsenic, and less frequently of cobalt and nickel.


FeAsS A white to steel-gray mineral crystallizing in the monoclinic system with pseudo-orthorhombic symmetry because of twinning; occurs in crystalline rock and is the principal ore of arsenic. Also known as mispickel.
References in periodicals archive ?
Mineralization in hole TOG-13-25 is described as strongly albitized and silicified conglomerate and porphyry units containing 1 to 8 percent finely disseminated pyrite with local arsenopyrite.
The two most widely quoted hypotheses are the oxidation of Arsenopyrite and Pyrite minerals and the reduction of Iron Oxyhydroxides.
Oxidized arsenopyrite grains were identified in the thin sections using SEM in the backscattered electron mode, and the FIB was used to prepare two sections for (S)TEM analysis from specified locations at the margins of two arsenopyrite grains (Fig.
25-meter sulfide-bearing zone containing pyrite, chalcopyrite and arsenopyrite as veins, veinlets, disseminations, and breccias in the interval of 111.
Mineral release curves for arsenopyrite, alloclasite, nickeline and safflorite-skutterudite are as follows.
Sample FFSB (Table 1), High grade quartz-sulphide (abundant arsenopyrite, pyrite, galena) from the dump by the main shaft, assayed 76.
Fine sulphide minerals, including arsenopyrite, were observed in association with carbonate veining and alteration in the two samples.
WGC-11-34B (-70 degree dip at 90 degree azimuth) encountered vein quartz carbonate veins with arsenopyrite and pyrite in two zones from 115.
0x20 The highest grade samples were collected 100 m from the intrusive contact in brecciated and silicified siltstone and chert with quartz veining and disseminated arsenopyrite with seven samples containing greater than 4.
In the Terrace Creek system with high gold grades, insufficient arsenopyrite is formed to encapsulate the gold and hence discrete gold grains have formed in and around the pyrite crystals.
In their letter, Acharyya and Shah stated that "pyrite or arsenopyrite is absent or very rare in aquifer sediments from the Bengal Basin (Acharyya et al.
Drill hole WGC-11-34 and WGC-11-34A encountered quartz carbonate veins with arsenopyrite and pyrite in two zones from 117-119 meters and 134-140 meters.