Minrecordite, Dioptase

CaZn(CO3)2, CuSiO3·H2O

Locality:

Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia

Field of View: 3.9 mm

Colorless to white minrecordite on dioptase. 

Doug Merson photo and collection.

Minrecordite  forms in oxidation zones  secondary mineral in carbonate-hosted zinc ores.

Dioptase is an uncommon mineral found mostly in desert regions where it forms as a secondary mineral in the oxidized zone of copper sulfide mineral deposits. Dioptase is a popular collectors’ mineral specimen and is smetimes cut into small emerald-like gems. The material is very soft to be worn as a ring-stone, but small specimens are sometimes mounted in pendants and brooches.