Compound molybdate and arsenate
Specific gravity: 6.6
Hardness: 2 to 3
Colour: Light green
Molybdofornacite is a very rare arsenic mineral.
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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