marcasite

noun mar·ca·site \ ˈmär-kə-ˌsīt , -ˌzīt ; ˌmär-kə-ˈzēt \

Definition of marcasite

1 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
2 :a piece of marcasite used in jewelry

Origin and Etymology of marcasite

Middle English marchasite, from Medieval Latin marcasita


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