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marcasite |
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marcasite (mär`kəsīt) or white iron pyrites, a mineral closely resembling and having the same chemical composition (FeS2) as pyrite pyrite (pī`rīt) or iron pyrites ..... Click the link for more information. . It differs from pyrite in that it is paler in color, becomes darker upon oxidation, and crystallizes in the orthorhombic system. Twinned crystals resembling cockscombs (cockscomb pyrites) or spearheads (spear pyrites) are of common occurrence. The mineral occurs in marls, clays, and limestones in many parts of the world. marcasiteIron sulfide mineral that forms pale bronze-yellow crystals; the name cockscomb marcasite refers to the shape of a common form of its crystals. Marcasite has the same chemical formula as pyrite (FeS2) but a different internal (atomic) structure. It is less stable than pyrite, being easily decomposed, and is much less common. marcasite a metallic pale yellow mineral consisting of iron sulphide in orthorhombic crystalline form used in jewellery. Formula: FeS2 marcasite [′mär·kə‚sīt] (mineralogy) FeS2A pale bronze-yellow to nearly white mineral, crystallizing in the orthorhombic system; hardness is 6-6.5 on Mohs scale, and specific gravity is 4.89. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Acid drainage occurs when water, air, certain bacteria, and sulfide metals (such as pyrite, marcasite, and chalcopyrite) come into contact with each other. Her co-host Julie Moran is still gown shopping but has her sights on a two-piece gown with a black marcasite crystal halter top by the young and hip designer Douglas Hannant. The upper 50 metres of the deposits are characterized by secondary zones of oxidation where the primary sulphides are replaced by chalcocite, malachite and cuprite-tenorite together with traces of native copper and marcasite. |
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