This is the polished blue shattuckite sphere. Diameter 3.7″ (95mm). Weight – 2.7lb (1223 grams). Origin: Africa.
Some information about shattuckite:
Shattuckite is a copper silicate hydroxide mineral. It crystallizes in the orthorhombic – dipyramidal crystal system and usually occurs in a granular massive form and also as fibrous acicular crystals. It closely allied to plancheite in structure and appearance.
Shattuckite is a relatively rare copper silicate mineral. It was first discovered in 1915 in the copper mines of Bisbee, Arizona, specifically the Shattuck Mine (hence the name).
It is a secondary mineral that forms from the alteration of other secondary minerals. At the Shattuck Mine, it forms pseudomorphs after malachite. It is sometimes used as a gemstone (More information about shattuckite).
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