Smithsonite ps. Calcite

Item Description

This is another old 19th. Century mineral specimen frm 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 cadmium rich greenockite has covered the crystals. This is a famous old occurrence and speicmens are rare today, aprticularly cabinet sized pieces such as this one which have preserved whole clusters. The Jefferis label acompanying is dated 1878.