arsenopyrite


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Related to arsenopyrite: pyrrhotite, molybdenite

arsenopyrite

(är'sĭnōpī`rīt, ärsĕn`ō–) or

mispickel

(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.

Arsenopyrite

 

(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.

arsenopyrite

[‚ärs·ən·ō′pī‚rīt]
(mineralogy)
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 ?
Based on imaging, EDS, and electron diffraction data collected from the two samples, it was concluded that arsenopyrite oxidation leads to the precipitation of the amorphous Fe-As-O coating.
They are situated in subvertical (up to 20-meter-thick) stratabound structures, referred to as "veins" (due to their vein shape), composed of metamorphosed black shales with basic pyroclastic material, quartz, pyrite/pyrrhotite and arsenopyrite.
The ore being mined contains some free gold and also gold associated with pyrite and arsenopyrite in a schist matrix, with grades of 1.
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.
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.
This facility has been used principally to calcine pyrite and arsenopyrite Au concentrates, but can readily accommodate carbonaceous materials materials a wide range of other minerals.
The veins are rich in a suite of sulfides that include pyrite, sphalerite, tetrahedrite, arsenopyrite and cinnabar in addition to the silver mineralization.
A 2 m wide zone in a trench located 120 m away contained disseminated arsenopyrite in shale and samples from this area contained gold values of 3.
Other sulfides and ore minerals include chalcopyrite, galena, marcasite, arsenopyrite, covellite and wurtzite.
Instead, gold-bearing pyrite and arsenopyrite concentrates are subjected to an alkaline leach under intense agitation.
The replacement bodies contain quartz, rhodochrosite and rhodonite with lesser amounts of galena, sphalerite, chalcopyrite, pyrite, arsenopyrite and pyrrhotite.