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marcasite

noun
mar·​ca·​site | \ ˈmär-kÉ™-ËŒsÄ«t How to pronounce marcasite (audio) , -ËŒzÄ«t; ËŒmär-kÉ™-ˈzÄ“t\

Definition of marcasite

1a : 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

First Known Use of marcasite

15th century, in the meaning defined at sense 1a

History and Etymology for marcasite

Middle English marchasite, from Medieval Latin marcasita

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More from Merriam-Webster on marcasite

Britannica.com: Encyclopedia article about marcasite

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