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Arsenopyrite crystallizes in the monoclinic crystal system and often shows prismatic crystal or columnar forms with striations and twinning common. Arsenopyrite may be referred to in older references as orthorhombic, but has been shown to be monoclinic. The crystal habit, hardness, density, and odor (garlic) when struck are supposedly diagnostic. Various transition group metals occur in arsenopyrite as subtitutes for iron. A cobalt rich variety is known as danaite. Arsenopyrite also can contain significant amounts of gold.
FeAsS -  Iron Arsenide Sulfide
Class:
Silver-white to steel gray
Black
Metallic
Opaque
6.2
5.5 - 6
Good
Uneven
Thick tabular to prismatic striated crystals, granular, massive
Non-fluorescent
Frequency:
Abundant
Origin:
It occurs in pegmatites; hydrothermal in high-temperature vein deposits and greisens; metamorphic in contact metamorphic skarns, gneisses and mica schists.

Occurence:
Ehrenfriedersdorf, Germany; Panasqueria, Portugal; Llallagua, Bolivia, Nikolai mine, Dalnegorsk, Russia; and from Hunan Province, China.
Application:
Ore of arsenic, minor source of gold, and as a mineral specimen.

 
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