cerussite
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Cerussite
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A white mineral form of lead (II) carbonate (PbCO3), a major
ore of lead, found in Mexico, Spain, southwest
Africa, Australia, and Colorado, USA. It is formed by weathering (oxidation)
of galena. It has prismatic or needle-shaped
crystals (orthrhombic) that are usually colorless or white, but may be green
or gray with a resinous or vitreous luster. White lead,
used as a paint pigment, is a basic lead (II) carbonate (PbCO3
+ Pb(OH)2). Hardness: 3–3.5; relative density 6.6.
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