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Cobaltite

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Cobaltite is a sulfide mineral compound of cobalt, arsenic, and sulfur, Its chemical formula is CoAsS. It contains up to 10% iron and variable amounts of nickel. Structurally, it resembles pyrite (FeS₂), with one of the sulfur atoms replaced by an arsenic atom. Although rare, it is mined as a significant source of the strategically important metal cobalt. Secondary weathering incrustations of erythrite, known as "Cobalt bloom," are common; erythrite is a pink to crimson hydrated cobalt arsenate mineral.

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Science History Institute. Cobaltite. Photograph, 2025. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/soynuj6.

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