Main Entry: mar·ca·site

Pronunciation: \ˈmär-kə-ˌsīt, -ˌzīt; ˌmär-kə-ˈzēt\

Function: noun

Etymology: Middle English marchasite, from Medieval Latin marcasita

Date: 15th century

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