This week’s Mineral of the Week (MotW) is dioptase! 20051 Dioptase, Calcite, Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia Subscribe to Dad Dad Diary. Related posts:Snow on the way?Book 'em Danno...A Good Thing or a Bad Thing...Erythrite, Mt Cobalt, QueenslandFound a Gold Mine... Critter Cam - Bin Spider! Ulrichite, Lake Boga