Wulfenite, Calcite and Duftite on a Dolomite cast

A tubular cast of pinkish-cream Dolomite forms a complete hollow tunnel which allows daylight to pass through its length. The outside surface, formed from lustrous Dolomite crystals is dotted with small Calcite crystals and speckled olive green with patches of Duftite. Hiding within the tube at one end are several well-formed pale yellow-buttermilk tabular Wulfenite crystals, the largest to about 1.3 cm on edge. This terrific and interesting Dolomite cast is from the Tsumeb mine in the Oshikoto Region of Namibia.