D defs.my
Entry 1 sense Webster, 1913

Marcasite

· Mar·ca·site · IPA /ˈmɑɹ.kə.sɑɪ̯t/
01 n. A sulphide of iron resembling pyrite or common iron pyrites in composition, but differing in form; white iron pyrites.
  1. 1.
    A sulphide of iron resembling pyrite or common iron pyrites in composition, but differing in form; white iron pyrites.(Min.)
Phrases & compounds
Golden marcasite — tin.