type of mineral, iron disulfide; type of iron pyrite; ornament made from iron pyrite
A sulphide of iron resembling pyrite or common iron pyrites in composition, but differing in form; white iron pyrites
Iron sulfide mineral that forms pale bronze-yellow crystals; the name cockscomb marcasite refers to the shape of a common form of its crystals. Marcasite has the same chemical formula as pyrite (FeS2) but a different internal (atomic) structure. It is less stable than pyrite, being easily decomposed, and is much less common