Dioptase      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  2.2 x 1.6 x 1.1 cm piece with large blocky very translucent to transparent crystals of an unusual habit.  Some lighter green second generation crystals.  Domical shape, damage-free.  Nicely mounted in a perky box.  Very nice piece!    $190