3.5" Rosasite, Aurichalcite and Selenite Crystal Association - Utah

Rosasite, Aurichalcite and Selenite Crystal Association - Utah #109831

This colorful specimen contains deep blue-green colored, botryoidal rosasite formations and aurichalcite, most of which is enshrouded in a thin layer of beautifully transparent selenite crystals. It was collected from the Hidden Treasure Mine in the Ophir District of Utah, a location that's well known for its zinc and copper mineral deposits.

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.

Selenite is a variety of gypsum, a soft sulfate mineral composed of calcium sulfate dihydrate (CaSO4 · H2O). When chemically pure, gypsum is transparent and colorless, but 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.

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