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FeS2 (sulfide) Color: pale yellow Streak: greenish black Hardness: 66 1/2 Specific gravity: 5.0 Cleavage: indistinct Fracture: conchoidal to uneven Luster: metallic Crystal form: cubic, crystal faces, often striated Transparency: opaque Gives off sparks when struck with a hard metal object. Found in igneous, metamorphic, and sedimentary rocks as an accessory mineral. May be found in hydrothermal veins. Also known as fool's gold. For an explanation of the properties (in bold face), click here >> |