Dims: 1.45x1.06x0.81" (3.68x2.69x2.07cm)
Wt: 0.81 oz. (23.0g)
Tasna, Potosi, Bolivia
This specimen is mostly bismuthinite, as a loosely intergrown mass of crystals. Most of what is visible, however, is a dull and slightly greenish-gray coating of bismutite (Bismuth Carbonate Oxide) which is the common oxidation product of bismuthinite. The bismuthinite is exposed around the edges and provides the specimen with quite a bit of sparkle, as it has a good metallic luster. The crystals, while small, have good crystalline form with a variety of shapes.