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:Speliothingies...A Tad Expensive...Gypsum Crystals...Finished Malachite Artwork...From Facebook to MeWe... Critter Cam - Bin Spider! Ulrichite, Lake Boga