2.4" Fibrous Rosasite & Aurichalcite Crystal Association - Mexico
This colorful specimen contains an association of blue-green, fibrous aurichalcite and rosasite crystal aggregations. This beautiful specimen was collected from the Ojuela Mine in Durango, Mexico. These crystals formed from a bright orange limonitic matrix.
Aurichalcite is a secondary mineral that forms in the oxidation zones of copper and zinc ore deposits. It has the chemical formula (Zn,Cu)5(CO3)2(OH)6 and often forms as radiating acicular blue-green crystals and linings along cavity walls.
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.