Calcite and Dioptase

I’ve had this specimen in my collection from my early years (1990’s) and I have many better, so time to let this one fly. One of the most prized combinations from Tsumeb. The largest rhomd is 1.5cm. Ex Geoff Krasnov collection.

Locality: Tsumeb Mine, Otjikoto Region, Tsumeb Namibia

Composition: calcium carbonate and copper cyclosilicate