This calcite crystal rosette is from the Tsumeb Mine, Tsumeb, Otjikoto Region of Namibia. This is an ore pipe deposit that is mined for copper lead and other metals. It is over 3000 feet deep and contains two oxidation zones. Over 300 mineral species have been identified at the mine. One of the gangue minerals is calcite. This specimen is made up of rosette type formations of calcite with small dolomite crystals attached. They have complex rhombic habits and host small dolomite crystals. Their luster is greasy to vitreous. This piece measures 4 x 3 1/4 x 2 inches or 102 x 83 x 50 mm.