This is an extraordinary piece of rare bismuth-sulfide Bismuthinite from the well known locality Tazna of Potosí, Bolivia. THIS IS NOT STIBNITE. It is a great specimen with superbly defined, sharp crystals with a high metallic silvery sheen. The striation is excellent and the overall condition, considering of that what it is is excellent. Exceeding hard to come by this stuff, especially in these days, as the great finds are over since decades. The Tazna Mine is a historic bismuth-tungsten mine in the high Andes of Bolivia that has produced noteworthy specimens for decades.