Descloizite (PbZn(VO₄)(OH)) is a lead-zinc vanadate that forms in the oxidized cap zones of polymetallic Pb-Zn-V deposits. Its rich orange-yellow streak, adamantine luster, and characteristic prismatic to pyramidal habit make it a highly recognizable secondary species. Tsumeb (Namibia) is the world standard for crystallized Descloizite, producing pyramid-shaped specimens with dark cherry-red to brownish-black coloration.
Key Facts
- Mohs hardness 3–3.5.
- Specific gravity 5.9–6.2 — very heavy for a non-metallic-looking mineral.
- Orthorhombic; pyramidal and prismatic crystals are diagnostic.
- Diagnostic orange-yellow streak distinguishes it from similar-colored Pb-bearing species.
- Forms a partial solid-solution series with mottramite (Cu-end member) and pyrobelonite.
Notable Localities
Tsumeb (Namibia) and Berg Aukas (Namibia) are world-class. Sierra de Córdoba (Argentina) yields large pyramidal crystals. Modest occurrences in Yunnan and Inner Mongolia oxidized Pb-Zn caps.
Found at these Localities
- Tsumeb Mine (楚梅布矿)
- Inner Mongolia (内蒙古)
- Yunnan (云南)
