Descloizite

Formula: PbZn(VO4)(OH)

Species: Phosphates, Vanadates

Colour: Brownish red, red-orange, reddish brown to blackish brown, nearly black

Lustre: Sub-Vitreous, Resinous, Waxy, Greasy

Hardness: 3 – 3½

Specific Gravity: 6.2

Crystal System: Orthorhombic

Member of: Adelite-Descloizite Group. Descloizite-Mottramite Series. The zinc analogue of Mottramite, vanadate analogue of Arsendescloizite. A secondary mineral often found in the oxidation zones of base metal deposits.
Name: Named in 1854 by Augustin Alexis Damour in honor of Alfred Louis Olivier Le Grand Des Cloizeaux (1817-1897), Professor of Mineralogy, University of Paris, who first described the mineral.

Type Locality: Sierra de Córdoba, Córdoba Province – Argentina