Blue and green botryoidal cornetite mineral crust from Congo.
Green botryoidal cornetite mineral clusters on dark matrix, Congo.
Full matrix specimen of blue and green cornetite, Congo.
Close view of blue and green botryoidal cornetite, Congo.
Green massive cornetite matrix with blue botryoidal crust, Congo.
Deep blue sparkling cornetite mineral layer from Congo against black.
Microcrystalline blue to cyan botryoidal cornetite mineral clusters, Congo.
Flat plate specimen of blue botryoidal cornetite from Congo.
Surface texture macro of flat blue botryoidal cornetite, Congo.
Full cornetite mineral specimen from Congo with mirror reflection.

Cornetite

Cornetite – Cu3(PO4)(OH)3
Elements: Copper, Phosphorus, Oxygen, Hydrogen
Class: Phosphates
Crystal System: Orthorhombic
Hardness: 4.5
Apatite
Talc (1)Diamond (10)
Softer than glass. A steel knife scratches it.
Origin: Origin: L’Etoile du Congo Mine, Lubumbashi, Haut-Katanga – Congo (drc)
Did you know?

Most secondary copper minerals turn green, so cornetite is the rebel: this rare phosphate comes in a deep sapphire blue instead.

Copper coated with CupriteCuprosklodowskite