The fine mineral specimen presented in this video is a specimen of dioptase on a matrix of calcite from The Tsumeb Corporation Mine in northern Namibia. Tsumeb was arguably the world’s greatest mineral specimen producing locality and dioptase is one of the best known of hundreds of mineral species recorded at Tsumeb.
The fine small cabinet sized dioptase on calcite specimen presented in this video is worth around US$7500. The dioptase crystals of this fine matrix dioptase specimen are sharp and pristine. Dioptase owes its color to the presence of copper cations in the dioptase crystal lattice. One of the best specimens of dioptase ever mined from Tsumeb, Namibia is a large cabinet sized specimen which features large crystals of dioptase with cerussite crystal twins and this piece is now part of The Houston Museum of Natural Sciences collection. It was appraised as being worth US$1,000,O00 before it was donated to the museum in the 1990’s .
Dioptase is a relatively rare mineral species that is found in the oxidized zone of some copper deposits which are also normally polymetallic deposits also. The type locality for dioptase is Altyn Tjube, Kazakhstan. A type locality is the locality which recorded the first characterized examples of a particular mineral species.
The calcite crystal cluster on the album cover is green because of the presence of microscopic dioptase crystal inclusions just below the rhombohedron faces of gthe calcite crystals. Tlhis form of the dioptase included calcite combination only only occurs at Tsumeb, Namibia.