Libethenite

Formula: Cu2(PO4)(OH)
Anhydrous phosphate containing hydroxyl
Specific gravity: 3.97
Hardness: 4
Streak: Light green
Colour: Light to dark green, blackish green, olive-green; bluish green to light green in transmitted light.
Solubility: Easily soluble in acids and ammonia
Environments:

Hydrothermal environments

Libethenite is a secondary mineral in the oxidised zone of copper deposits, associated with malachite, azurite, pyromorphite, pseudomalachite and chrysocolla. The phosphate is often derived from the weathering of apatite and other rock-forming phosphates such as monazite and xenotime. A rare case of probable primary libethenite from a greisen deposit has been reported.

At Block 14, Broken Hill, New South Wales, Australia, libethenite is associated with corkite-hinsdalite, tsumebite and pyromorphite, and more rarely with sampleite and tormenite. At a deeper level it is associated with dufrenite, strengite and beraunite, as well as corkite-hinsdalite.

At the Kintore cut, Broken Hill, New South Wales, Australia, libethenite is a late-forming mineral in quartzite associated with corkite-hinsdalite. Mineral assemblages here usually include libethenite - pseudomalachite - azurite and libethenite - pyromorphite - hemimorphite - sampleite.

At Desolation Prospect, Queensland, Australia, libethenite is always associated with malachite and chrysocolla, and sometimes with pseudomalachite.

At the type locality, the Podlipa deposit, Ľubietová, Slovakia, libethenite occurs in a polymetallic hydrothermal ore deposit associated with malachite.

At the Chino mine, Grant county, New Mexico, USA, libethenite occurs in the oxidised portion of the orebody associated with pseudomalachite, apatite and chrysocolla.

Common impurities: As