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

Stout dioptase crystals scattered on calcite crystals displaying nice colour contrast. The tallest dioptase is 0.5 cm. More old stock from Prosper J. Williams, probably dating to the late 1970s - early 1980s. Comes with one of Prosper's labels. From Tsumeb, Namibia. Dimensions: 3.75 x 3.75 cm