This Specimen has been sold.
2.7" Selenite Encrusted Rosasite Clusters - Mexico
This colorful specimen features aggregations of rosasite that have been encrusted in a layer of selenite. This beautiful specimen was collected from the Ojuela Mine in Durango, Mexico. These crystals formed from a bright orange limonitic matrix.
Selenite is a variety of gypsum, a soft sulfate mineral that is composed of calcium sulfate dihydrate (CaSO4 · H2O). When chemically pure, gypsum is transparent and colorless, however, impurities give the gypsum a diverse range of colors and formations. Desert rose, selenite and satin spar are just a few of the varieties of gypsum known to have formed though hydrothermal processes.
Rosasite is a secondary mineral that forms in oxidation zones of copper-zinc deposits, generally forming a fibrous botryoidal sphere that can appear vitreous and silky. While typically featuring a blue-green color, colorless specimens are not unheard of. The chemical formula of rosasite is CuZnCO3(OH)2.