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Chemical FormulaPbSCompositionLead sulfide. May contain impurities, such as silver, arsenic, antimony, and copper.Variable Formula(Pb,Ag,As,Sb,Cu)SColorSteel-grayStreakSteel-grayHardness2.5 - 3Crystal SystemIsometric3D Crystal Atlas

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Crystal Forms

and AggregatesCrystals, which may be cubes, octahedrons, or a combination of the two frequently occur. Cubes are often partially cleaved. Dodecahedrons are far less common. Also occurs massive, grainy,fibrous, platy, as veins, and as cleavage fragments.

TransparencyOpaqueSpecific Gravity7.4 - 7.6LusterMetallic. Turns somewhat dull after exposure to air.Cleavage1,3 - Cubic. May exhibit parting on octahedrons.FractureSubconchoidalTenacityBrittleIn GroupSimple SulfidesStriking FeaturesSteel-gray color, extreme heaviness, and fine cleavageEnvironmentIn In sedimentary limestone deposits, hypothermal veins and mesothermal veins, inhydrothermal replacement deposits, and in placer deposits.

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13y ago

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