Willemite on Dolomite  – Tsumeb Mine, Otavi Mountains, Oshikoto, Namibia
 
Willemite crystals on dolomite. The crystals are bright blue and transparent . Under shortwave, the Dolimit glows intensely orange-red, under longwave, the Willemit appears yellow. A rarity of such good quality from the Tsumeb mine in Namibia.