Noun
A mineral of a tin-white color and metallic luster, containing arsenic, sulphur, and iron; -- also called arsenical pyrites and mispickel.
Source: Webster's dictionaryOn roasting arsenopyrite in air, arsenic sublimes as arsenic(III) oxide leaving iron oxides, while roasting without air results in the production of metallic arsenic. Source: Internet
Gold-containing arsenopyrite ores are similarly reactive toward inorganic cyanide. Source: Internet