marcasite
/ˈmɑːkəsʌɪt//ˈmɑɹ.kə.sɑɪ̯t/
noun
- 1
The orthorhombic form of iron disulfide, FeS2, occurring as yellow crystals.
- 2
(jewellery) Pyrite.
- 3
Any of various metal sulfides, usually iron sulfide minerals.
Synonyms
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