lead carbonate

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lead car·bon·ate

a heavy white powder insoluble in water; occasionally, it is used to relieve irritation in dermatitis, but it is used largely in the manufacture of paint and in the arts and is thus productive of lead poisoning.
Synonym(s): ceruse, white lead
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Most of the beads have 'seams', lines on the cerussite core which are composed of more compact crystals of pyromorphite, sometimes projecting from the cerussite surface and appearing as a ridge.
Ore minerals include gold, silver, chalcopyrite (CuFeS2), galena (PbS), bornite (CuFeS4), covellite (CuS), chalcocite (Cu2S), anglesite (PbSO4), sphalerite (ZnS), argentite (Ag2S), cerussite (PbCO3) and smithsonite (ZnCO3).
Until now, no one has been able to facet, or cut, a cerussite larger than 200 carats.