Dioptase, Duftite & Calcite, Tsumeb, Namibia (Ex Prosper J. Williams)

An attractive miniature of 1 mm sized dioptase sprinkled on lustrous calcite crystals. There are few tufts of light green duftite (?). Other species may be present too that I cannot identify. An old piece from the inventory of Prosper J. Williams and includes one of his labels. From Tsumeb, Namibia. Dimensions: 4.5 x 6 cm