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Cerussite

Cerussite is generally colourless, but white, grey, and black specimens have been discovered. Its two most distinctive features are its high density and it is adamantine lustre. Crystals possess a stubby tabular or elongate habit. Although attractive, it's too soft to possess much value like a gemstone, and it is cut solely for collectors.
Cerussite is generally found around lead ores. Large, clear, transparent, colourless, cuttable crystals have been discovered in Tsumeb (Namibia). Other localities include Austria, Australia, Czechoslovakia, the united states, Germany, Scotland, and Italy, including Sardinia.
Sometimes wrongly identified as diamond along with other colourless gems, it might be distinguished by its higher density.



Properties
Chemical Composition: Lead carbonate
Crystal System / Forms: Orthorhombic
Hardness: 3.5
Specific Gravity: 6.51
Lustre: Adamantine
Refractive Index / Birefringence: 1.80-2.08 / 0.274
Cuts & Uses: Brilliant, Mixed.
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