Check the listing for details. JH17541 Chalcedony, Skorpion Mine, Namibia. Listed at 15.00 USD. The Skorpion Mine is the 8th largest Zinc mine in the world and is unique in several ways. It is one of the few Zinc deposits that is composed almost exclusively of Zinc Silicates like Sauconite (Formula: Na0.3Zn3(SiAl)4O10(OH)2·4H2O) and Hemimorphite (Formula: Zn4(Si2O7)(OH)2·H2O) and Zinc Carbonates like Smithsonite (Formula: ZnCO3) and Hydrozincite (Formula: Zn5(CO3)2(OH)6).
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