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About Our Definitions: All forms of a word (noun, verb, etc.)
are now displayed on one page. 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.