Rare Dioptase Specimen from the Republic of Congo – This exceptional mineral collector's specimen is distinguished by its intensely dark green to turquoise, angular dioptase crystals in magnificent formation. Dioptase, also known as copper emerald, is a rare copper silicate mineral[1][3] that forms in the oxidation zone of copper deposits and is particularly prized by collectors for its deep green color[10]. This high-quality specimen, with measurable dimensions of 24×11×8 mm and a weight of 3.45 g, comes from the well-known locality of the Republic of Congo, one of the world's most important dioptase deposits[5].
