cobaltian arsenopyrite

mineral

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June 24, 2026

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Cobaltian arsenopyrite is a mineral that is a variation of arsenopyrite, an iron sulfoarsenide mineral and a common ore of arsenic. In cobaltian arsenopyrites, cobalt partially replaces iron within the mineral's structure.1

Arsenopyrite typically forms in high-temperature ore veins. When exposed to weathering, arsenopyrite alters into arsenates, such as scorodite. Cobalt, a ferromagnetic metal, has been used for centuries to create blue glazes and ceramics. Historically, ores containing arsenic and cobalt were mistakenly called kobold, meaning goblin, due to their poisonous nature.12

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arsenopyrite
…partially replaces iron is called cobaltian arsenopyrites; those in which the Co:Fe ratio lies between 1:2 and 6:1 are called glaucodot (see also cobaltite). Weathering alters these sulfides to arsenates: arsenopyrite to scorodite, and glaucodot to erythrite. For detailed physical properties, see sulfide mineral (table).
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…partially replaces iron is called cobaltian arsenopyrites; those in which the Co:Fe ratio lies between 1:2 and 6:1 are called glaucodot (see also cobaltite). Weathering alters these sulfides to arsenates: arsenopyrite to scorodite, and glaucodot to erythrite. For detailed physical properties, see sulfide mineral (table).
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