Arsenopyrite
Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
Mineral NameArsenopyrite
Chemical FormulaFeAsS
Mohs Hardness5.5
Crystal Systemmonoclinic
Lustermetallic
Streak Colordark grayish-black
Cleavagedistinct on {101}
Fractureuneven
Specific Gravity6
Colorssilvery-white, steel-gray, yellowish-bronze
Transparencyopaque
Type LocalityYaogangxian Mine, Yizhang County, Chenzhou Prefecture, Hunan Province, China
Mineral GroupSulfides
Usesore of arsenic, minor ore of gold, collector
Associated Mineralsquartz, pyrite, chalcopyrite, scorodite
Raritycommon
Description
A silvery-metallic, blocky specimen of arsenopyrite, partially covered by a fine-grained, mossy green secondary mineral.
Geological Context
Arsenopyrite is a common mineral found in high-temperature hydrothermal veins, contact metamorphic deposits, and pegmatites, often associated with other sulfide minerals.
