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Wildcat Mines of the Mother Lode
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pyrite An isometric mineral, FeS2 ; dimorphous with marcasite; forms a series with cattierite; crystallizes in cubes and pyritohedra; sparks readily if struck by steel; metallic; pale bronze to brass yellow; hardness varies from 6.0 to 6.5; occurs in veins, as magmatic segregation, as accessory in igneous rocks, and in metamorphic rocks; a source of sulfur. Also known as fool's gold.
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