Species: Tennantite after azurite or chalcocite with smithsonite
Locality: Tsumeb mine, Tsumeb, Otjikoto region, Namibia
Dimensions: 18.5 x 16 x 4.8 cm.
Tennantite psuedomorphs after a number of different species are well-known from Tsumeb, but this is a particularly large, fine and undamaged example featuring numerous sharp, prismatic azurite (or possibly chalcocite) crystals replaced by tennantite with an overgrowth of lustrous white to gray smithsonite creating a wonderful aesthetic affect. Some have speculated these tennantite psuedos were originally chalcocite or enargite, but based on morphology and other factors I think azurite is more likely in my personal opinion. In any case this is an impressive large Tsumeb classic in great condition, with good aesthetics and form, from an old collection. These are rarely seen in this size and quality from Tsumeb anymore. Mark Cross photos.