Definition of marcasite noun from the Oxford Advanced American Dictionary

 

marcasite

 noun
noun
NAmE//ˈmɑrkəˌsaɪt//
 
, NAmE//ˈmɑrkəˌzit//
 
, NAmE//ˈmɑrkəzit//
 
[countable, uncountable]
 
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a yellow semi-precious stone used in jewelry
See the Oxford Advanced Learner's Dictionary entry: marcasite