A UNIQUE and UNUSUALLY SHAPED Tusmeb specimen of reniform, botryoidal, green to grayish mottramite, This piece is very heavy for its size, because the banded mottramite is cored with massive cuprite. 162 grams. The end and base reveal the banding and cuprite core. Showy in its own way. Ex. Rob Smith Collection, a noted Tsumeb collector.