3.2" Rosasite, Selenite and Ferroan Dolomite Association - Morocco
This colorful specimen contains blue-green colored rosasite crystals on a bed of dark reddish brown ferroan dolomite. Small translucent selenite crystals can be found atop the dolomite as well as enshrouding the rosasite crystal formations.
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.