Dioptas – ein natürliches Kupfersilikatmineral

Dioptase is a mineral, a copper silicate, crystallizing in the trigonal system. It forms short to long columnar crystals with a wedge-shaped termination, or occurs in granular to solid aggregates. Dioptase is an unusual mineral that occurs mainly in desert areas. It is very rare, occurring only in a few known deposits in the world - namely in Congo, Namibia and Kazakhstan. Its typical dark green color, for which it is very popular and sought after among collectors. Interesting fact - dioptase crystals were used as an ornament of Neolithic statues, which date back to around 7200 BC.

Dioptase - a mineral with an intense green color
Dioptas is a basic copper silicate with the chemical formula CuSiO₃·H₂O. It is known for its typical deep green color, which can resemble emerald. Due to its distinctive color, it is one of the most aesthetically attractive copper minerals.

Appearance and properties of dioptase
Dioptas crystallizes in the clinker system and forms small, but very shiny and translucent crystals. The hardness is between 5–5.5 on the Mohs scale. The most valued are specimens with a rich growth of crystals on the substrate.

Dioptase deposits
Significant dioptase deposits are found in the Democratic Republic of the Congo, Namibia, Kazakhstan and Chile. Namibian crystals from the Tsumeb area are among the most beautiful in the world.

History and uses of dioptase
Dioptas was known in ancient times and was often confused with emerald due to its color. Today, it is highly valued by collectors and appears in mineralogical exhibitions around the world.