Dioptase from Tsumeb

Dioptase is a striking copper cyclosilicate mineral, renowned for its intense emerald-green to bluish-green color and vibrant, transparent crystals. Its trigonal crystal system produces six-sided prisms terminated by rhombohedra, and its vitreous luster adds to its visual allure. With a Mohs hardness of 5, dioptase is relatively fragile and must be handled with care.

Collectors prize dioptase for its rarity and beauty, and it is sometimes cut into small gemstones or used as a pigment in painting. The mineral’s vivid color and perfect cleavage make it a standout in any collection.

It's typically found in desert regions including at Tsumeb in Namibia, and Reneville in Congo-Brazzaville. It ranges from intense emerald-green to bluish-green. Neolithic statues dating back to 7200 B.C. have been discovdered that used dioptase for decoration.