A silvery-gray mineral consisting of an arsenide and sulfide of iron.
- Chemical formula FeAsS.
- Pseudomorphs of marcasite, chalcopyrite, pyrite, arsenopyrite, pyrargyrite, magnetite, and quartz after pyrrhotite have been reported.
- Iron and copper sulfides of this region are predominately pyrite, pyrrhotite, chalcopyrite, arsenopyrite, bornite, and marcasite.
- There were shops full of green and purple fluorite, ferberite and arsenopyrite, and spessartine and stibnite.
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