Sturmanite, Gypsum
Thumbnail, 2.5 x 1.0 x 0.5 cm
Black Rock Mine, Black Rock, Kalahari manganese fields, Northern Cape Province, South Africa

This is a fine pseudomorph. The Sturmanite, which replaces what appears to be extruded Gypsum, has a very nice color and superb luster. Ex. Willy Israel Collection.