Dioptase, Tsumeb, Namibia (Ex Prosper J. Williams)

2-4mm sized dioptase crystals liberally scattered over a light-coloured drusy matrix; nice colour contrast. Almost all of the dioptase crystals show sharp terminations although a few show damage. Minor duftite (?) on the reserve side. An old specimen from Prosper J. Williams obtained from Sarah Topham's 1980s inventory. Accompanied by an old label from Prosper. From Tsumeb, Namibia. Dimensions: 4 x 6 x 6 cm