Molybdofornacite

minerals

wulfenite

duftite

willemite

Formula:CuPb2(MoO4)(AsO4)(OH)
Compound molybdate and arsenate
Specific gravity: 6.6
Hardness: 2 to 3
Streak: Yellow
Colour: Light green
Environments

Hydrothermal environments

Molybdofornacite is a very rare arsenic mineral.

Localities

At the type locality, the Tsumeb Mine, Oshikoto Region, Namibia, molybdofornacite was found as minute crystals on a dioptase specimen in the deep oxidation zone of a dolostone-hosted hydrothermal polymetallic ore deposit. It is the latest oxidation product in the association which also includes calcite, quartz, limonite and duftite (AM 69.567). Associated minerals include dioptase, duftite, wulfenite, quartz, calcite and hematite (HOM).

At the Tonopah-Belmont mine, Arizona, USA, molybdofornacite has been found associated with wulfenite and pyromorphite (HOM).

At the Bullfrog #2 claim, New Mexico, USA, molybdofornacite has been found associated with mimetite, descloizite, willemite, chrysocolla and hematite (HOM).

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