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noun\ˈmär-kə-ˌsīt, -ˌzīt; ˌmär-kə-ˈzēt\
Definition of MARCASITE
a: crystallized pyrite
b: a pale yellow to white mineral of the same composition and appearance as pyrite but of different crystalline organization and lower specific gravity
: a piece of marcasite used in jewelry
Origin of MARCASITE
Middle English marchasite, from Medieval Latin marcasita
First Known Use: 15th century
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 (FeS) but a different internal (atomic) structure. It is less stable than pyrite, being easily decomposed, and is much less common.