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:Mineral-Themed Face Masks Take Two...Zoom. Just one look and then...New Lights 2...Hobart Mineral ShowRainbows and Rhodochrosite... Critter Cam - Bin Spider! Ulrichite, Lake Boga