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marcasite




marcasite
A brass-yellow mineral, iron sulfide (FeS2), found commonly in near-surface deposits. It is found as tabular or prismatic crystals in the orthorhombic system, as cockscomb aggregates as stalactitic, globular,a nd radiating forms. It has a metallic luster and is brittle. Hardness 6–6.5; relative density 4.9.


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   • GEOLOGY AND PLANETARY SCIENCE