D. Kim Cathcart Collection Here is an exceedingly rare Tsumeb mineral. The sharp brown pseudo-octahedral crystal hiding in a crevice of the specimen is the rare germanium mineral stottite. There is a single red bladed crystal crossing one of the secondary stottite crystals that Kim has identified as ludlockite on his label, but I’m not so sure. This should have more research done. Kim purchased the specimen from Bill Pinch in 1995.