|1.||a metallic pale yellow mineral consisting of iron sulphide in orthorhombic crystalline form used in jewellery. Formula: FeS2|
|2.||a cut and polished form of steel or any white metal used for making jewellery|
|[C15: from Medieval Latin marcasīta, from Arabic marqashītā, perhaps from Persian]|
|marcasite (mär'kə-sīt', -zīt') Pronunciation Key
A light yellow to gray, metallic, orthorhombic mineral. Marcasite is a polymorph of pyrite and looks similar to it but has a lower specific gravity, is paler in color, and often has a radiating fibrous structure. Chemical formula: FeS2.