Home > Laskowski Ⅱ – June 29 > MS1847 Cornwallite coating Azurite found 2000

Cornwallite coating Azurite found 2000 - Sold

Cornwallite is a hydrous copper arsenate. Zippe (1847) named the species after Cornwall, England, source of the original mineral.

Cornwallite here encrusts bladed azurite crystals to 2 mm. This may represent the initialization of a cornwallite pseudomorph after azurite. Cornwallite pseudomorphs are known from this locality, sometimes labeled after clinoclase. But perhaps some of the cornwallite pseudomorphs from Majuba Hill are actually replacing azurite. Nice piece. From the collection of E.R. Laskowski (1949-2020), a mining engineer who retired to Tucson, Arizona. Laskowski self-collected this specimen August 18-19, 2000.