Dims: 3.0" x 2.9" x 0.5" (7.6 x 7.4 x 1.3 cm)
Wt: 6.19 oz. (175.5 g)
Cobalt, Ontario, Canada
This intriguing specimen consists of a cut slab of a white calcareous matrix in which rests countless formations of skutterudite, a cobalt arsenide mineral- most of the specimen is made up of this material. However, there is a small amount of a dark gray host rock, and at least one vein of native sheet Silver runs through it. The Silver, though heavily tarnished to an almost black color, still shows a metallic luster along the cut surface, and hints of a silvery-white coloration are visible on the small rough areas. It shows no discernable form. The skutterudite shows a very odd form that is reminiscent of frost patterns on a window, but I hesitate to call it a "dendritic" form. It has a bright, silvery-white color and a metallic luster like the Silver, though it is not quite as easy to examine.