What a remarkable and large crystal pair of this relatively rare cobalt arsenic sulfide, one of those ultimate old European classic minerals! The Cobaltite crystals measure 2.7 and 2.5 cm respectively and exhibit a silvery gray metallic luster with a slight patina that is suggestive of their century-old age, and you can see three numerical labels from different collections throughout the history of the piece on the bottom. Edges and faces of these nearly complete crystals are quite sharp with only a few dings as expected of these from this locality as most crystals are frozen in a Pyrrhotite-Chalcopyrite sulfide matrix. There are vestiges of both of these minerals around the periphery of the piece. Given the pyritohedron forms, they are very geometric and very three-dimensional. There is even a third, much smaller, and mostly incomplete crystal in the back. The photos don't convey how good this this piece is; it looks like a Pyrite crystal with almost a Carrollite color. They're big and significant! A former Dick Hauck Collection specimen from the Dr. Eugene E. Sensel collection (#M256) (label to be provided if possible...we are trying to find it now in old materials and files from the Lemanski acquisition, but we know this from the master list). Sensel purchased it for a relative fortune at the time for a small dark mineral, $125, in 1982. This is a world class miniature for the rare species. I have only seen similar in museums, and in exhibitions in Europe such as Erika Pohl's.