Beautiful scattered distinctive crystals of Dioptase on Calcite from the world class location Tsumeb Mine, Namibia. The Dioptase crystals measure to 1cm and are artistically clustered in a shallow convex cavity in a Calcite matrix. The Dioptase crystals have a bright vitreous luster with a fine green colour, with some crystals displaying internal neon green reflections. Many of the larger crystals show faint striation on the prism faces. A fine display specimen of Dioptase from Tsumeb.