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

Large dioptase crystals to 0.5 cm completely covering carbonate matrix on one side. Nice colour! Several crystals show damage but could possibly be trimmed off. Could be some other mineral species present. Old stock from Prosper J. Williams and comes with one of his labels. From Tsumeb, Namibia. Dimensions: 5 x 5 x 8 cm