Dims: 2.10x1.57x0.73" (5.34x4.00x1.85cm)
Wt: 2.04oz (57.7g)
Uruchaqua Mine, Ancash Department, Peru
This is a fragment of a rhodochrosite stalactite, cut and polished to a high gloss on one surface to reveal the beauty of the rhodochrosite. It appears that a base of a black mineral (possibly manganite or hematite) that includes spots of a metal sulfide which may be pyrite but might also be the rare manganese sulfide alabandite, has multiple layers of rhodochrosite crystals in various sizes, capped with a half-dozen concentric rings of microcrystalline rhodochrosite. The final layer around the specimen is probably calcite with a yellowish color and no signs of crystals. There is a broken, old, weathered surface on the specimen which reveals some rhodochrosite crystals by way of fractures and cleavage surfaces.