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:Birthday Trip...Erythrite, Mt Cobalt, QueenslandMineral of the Week - Alunite GroupBetter Late Than Never...Monthly Mineral Chronicles Volume 3 Issue 3 Critter Cam - Bin Spider! Ulrichite, Lake Boga