Dioptase on Calcite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  These crystals are gemmy and sit on very bright white calcite.  It is in excellent condition but does show a rub to one crystal in the lower part of specimen as viewed in first two pictures.  This one measures 5 x 3.5 x 2.8 cm.   This is a high quality example that is even better in-hand.   $390