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marcasite

Pronunciation: /ˈmɑːkəsʌɪt, -ziːt/

Definition of marcasite

noun

a semi-precious stone consisting of iron pyrites.
[mass noun] a bronze-yellow mineral consisting of iron disulphide but differing from pyrite in typically forming aggregates of tabular crystals.
a piece of polished steel or a similar metal cut as a gem.