Murdochite

minerals

creaseyite

mimetite

dioptase

Images
Formula: Cu12Pb2O15Cl2
Simple oxide
Specific gravity: 6.47
Hardness: 4
Streak: Black
Colour: Black
Solubility: Insoluble in cold dilute nitric acid, but dissolves when the acid is warmed (Dana)
Environments:

Hydrothermal environments

Murdochite is a secondary mineral found in the oxidised zones of lead-copper deposits, associated with boleite, bromine-bearing chlorargyrite, chrysocolla, diaboleite, dioptase, hemimorphite, iranite, limonite, malachite and plattnerite (Mindat).

Localities

At the Chah Khouni mine, Anarak District, Nain County, Isfahan Province, Iran, murdochite is associated with bromium-bearing chlorargyrite, chrysocolla, dioptase, plattnerite, hemimorphite, iranite, boleite, diaboleite and limonite (HOM).

At Mapimí, Mapimí Municipality, Durango, Mexico, murdochite is associated with plattnerite, malachite and limonite (HOM).

At the type locality, the Mammoth-Saint Anthony mine, Saint Anthony deposit, Tiger, Mammoth Mining District, Pinal county, Arizona, USA, tiny black octahedra of murdochite were found on the surface of and embedded within plates of wulfenite, and on the surface of fluorite crystals. Hemimorphite, willemite and quartz were also present (AM 40.904-906). Other associated minerals include descloizite, dioptase, chrysocolla, creaseyite and quartz (HOM, Mindat).

At the Bird Nest drift, Otto Mountain, Baker, Soda Mountains, Silver Lake Mining District, San Bernardino county, California, USA, murdochite is found as lustrous black octahedral crystals, to 0.4 mm, often associated with cerussite, vauquelinite and wulfenite (R&M 86.2.141).

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