Smithsonite, Calcite

Unknown Owner

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This is another old 19th Century mineral specimen from the famous late-1800s Jefferis collection. In this case smithsonite has pseudomorphed calcite crystals which reach 3.75 cm across. In addition, a surface coating of greenockite, cadmium sulfide, has covered the crystals. This is a famous old occurrence and specimens are rare today, particularly cabinet sized pieces such as this one which have preserved whole clusters. The Jefferis label accompanying is dated 1878. Ex. Carnegie Museum Collection.