Description: This is the Dioptase specimen, from Namibia, wide around 13.5cm, biggest crystal wide 2cm. Dioptase is the mineral containing elements: Cu, Si, O, H, Mohs Hardness is 5. For this Dioptase specimen, has emerald-green color, and bright luster, transparent to translucent, sharp geometric edges, outstanding on the white Quartz clusters, very strong color contrast! Very rare high quality Dioptase crystals! From world famous mineral specimens’ locality!