marcasite
mar·ca·site
noun\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 of MARCASITE
Middle English marchasite, from Medieval Latin marcasita
First Known Use: 15th century
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