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:New Lights...Unboxing...New Minerals Site...A Rare Mix...Calm Before the Storm... Critter Cam - Bin Spider! Ulrichite, Lake Boga