mar·ca·site (mär k -s t , -zt)n. 1. A mineral with the same composition as pyrite, FeS2, but differing in crystal structure. Also called white iron pyrites. 2. An ornament of pyrite, polished steel, or white metal. [Middle English, from Medieval Latin marcas ta, from Arabic marqa   , from Aramaic marqit, from Akkadian mar au, from marai, ancient region in the eastern Iranian plateau.]mar ca·siti·cal (-s t-kl) adj. |
marcasite [ˈmɑːkəˌsaɪt]
n
1. (Earth Sciences / Minerals) a metallic pale yellow mineral consisting of iron sulphide in orthorhombic crystalline form used in jewellery. Formula: FeS2
2. (Clothing, Personal Arts & Crafts / Jewellery) a cut and polished form of steel or any white metal used for making jewellery
[from Medieval Latin marcasīta, from Arabic marqashītā, perhaps from Persian]
marcasitical [ˌmɑːkəˈsɪtɪkəl] adj
| marcasite (märk-st, -zt) 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. |
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