Penroseite is a very rare nickel, cobalt, copper selenide and this rich and fine specimen is from the Type Locality - the Virgen de Surumi Mine of Bolivia. The famous selenium minerals from this locality have often been falsely attributed to the Hiaco mine (2km west, on the opposite flank of Pakajake canyon) or to the Colquechaca mine (28km southwest), but neither of those mines yields any selenium minerals at all. Silvery, metallic, parallel-growth blades of penroseite comprise nearly all of this very rich specimen. Accompanied by a 1950s era, faded Burminco label that has a penciled-in, August, 1951 date. Ex. Mullane Collection. Weighs 60 grams.