Dioptase - Mineral Specimen unique calcite The crystals grew in open

The crystals grew in open cavities within a hydrothermal system

Great detail & preservation with the wood being replaced by agate

but unlike softer-looking stones

The overall look is dark and dramatic

this material is a rare geological phenomenon

Dioptase - Mineral Specimen unique calcite The crystals grew in openMined from: Renville Mine, Pool Department, Republic of the Congo Description: This dioptase specimen from the Renville Mine shows a classic botryoidal copper rich matrix coated with dense clusters of deep green crystals lining a natural cavity. The outer surface has that velvety, granular look typical of oxidized copper minerals, while the interior opens into a pocket of well formed, glassy dioptase crystals. The contrast between the rough exterior