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
Learn More about marcasite
Britannica.com: Encyclopedia article about "marcasite"
Seen and Heard
What made you want to look up marcasite? Please tell us where you read or heard it (including the quote, if possible).