One of the mysteries of the English language finally explained.
A silvery-gray mineral consisting of an arsenide and sulfide of iron.
Chemical formula FeAsS
- ‘Minerals such as wolframite, arsenopyrite, fluorite, and quartz are well known from this mine.’
- ‘There were shops full of green and purple fluorite, ferberite and arsenopyrite, and spessartine and stibnite.’
- ‘Iron and copper sulfides of this region are predominately pyrite, pyrrhotite, chalcopyrite, arsenopyrite, bornite, and marcasite.’
- ‘Pseudomorphs of marcasite, chalcopyrite, pyrite, arsenopyrite, pyrargyrite, magnetite, and quartz after pyrrhotite have been reported.’
- ‘One quick stop was made at the abandoned New First of May mine, where on the ore pile we found galena, pyrite, arsenopyrite, and fluorite.’
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