noun🔗ShareThe orthorhombic form of iron disulfide, FeS2, occurring as yellow crystals."The geology student identified the shiny, yellow crystals as marcasite, a form of iron pyrite. "geologymineralchemistrymaterialsubstanceChat with AIVocabulary GamePractice Reading
noun🔗Share(jewellery) Pyrite."The antique brooch was decorated with sparkling marcasite, giving it a vintage look. "materialgeologyChat with AIVocabulary GamePractice Reading
noun🔗ShareAny of various metal sulfides, usually iron sulfide minerals."The geology student identified the shiny, brass-yellow mineral as marcasite, an iron sulfide. "mineralgeologymaterialsubstanceChat with AIVocabulary GamePractice Reading
