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:An Exciting Opportunity...Catalogue Additions - WulfeniteMineral of the Week...To Erb is Human...MotW Sceptred Crystals Critter Cam - Bin Spider! Ulrichite, Lake Boga