- Cobaltian Dolomite Cast After Calcite
- Small Cabinet, 8.8 x 7.6 x 1.0 cm
- Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
- Ex. James and Marjorie Ferguson
This oddball is a cast formed as a thin layer of (sturdy!) cobaltian dolomite coated an existing plate of rhombohedral calcite crystals. The calcites then dissolved away, leaving this cast plate with both positive and negative sides showing!