Aurichalcite
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameAurichalcite
Chemical Formula(Zn,Cu)5(CO3)2(OH)6
Mohs Hardness1
Crystal Systemorthorhombic
Lustersilky
Streak Colorpale bluish-green
Cleavageperfect on {100}
Fractureuneven
Specific Gravity3.5
Colorspale blue, light green, bluish-green
Transparencytranslucent
Type LocalityBisbee, Warren District, Mule Mts, Arizona, USA
Mineral GroupCarbonates
Usescollector
Associated Mineralshemimorphite, malachite, azurite, calcite, limonite
Rarityuncommon
Description
Aurichalcite typically forms delicate, acicular to fibrous crystals that often aggregate into velvety crusts, tufts, or radiating sprays. It is characterized by its distinctive pale blue to bluish-green color.
Geological Context
Aurichalcite is a secondary mineral found in the oxidized zones of zinc-copper ore deposits. It forms through the alteration of primary zinc and copper sulfides in the presence of carbonate-rich solutions.
