Phosphohedyphane

phosphate

mimetite

Formula: Ca2Pb3(PO4)3Cl
Anhydrous phosphate with halogen, lead mineral, apatite supergroup, svabite subgroup.
Specific gravity: 5.92 calculated
Hardness: 4
Streak: White
Colour: Colourless
Environments

Hydrothermal environments

Phosphohedyphane is a rare secondary phosphate.

At Lilydale, Victoria, Australia, phosphohedyphane is found in recrystallised limestone in the alteration zones around lead and zinc sulphides (AJM 13.2.73-82).

At the type locality, the Capitana Mine, Copiapó Province, Atacama, Chile, phosphohedyphane occurs as a secondary mineral in the oxidised zone of a copper-lead-silver deposit, associated with quartz, duftite and bayldonite (Mindat, AM 91.1909-1917).

At Roughton Gill, Caldbeck Fells, Cumbria, England, UK, phosphohedyphane occurs mixed with pyromorphite (JRS 11.3-28)

At Short Grain, Caldbeck Fells, Cumbria, England, UK, phosphohedyphane crusts a few tens of micrometres thick have been found overgrowing globular mimetite and in turn overgrown by arsenic-bearing pyromorphite (JRS 12.47-61)

At the Whitwell quarry, Derbyshire, England, UK, phosphohedyphane has been found on and replacing galena, and in a cavity in galena - baryte veinstone partially replacing cerussite (RES pps 138, 139)

At the Gallagher Vanadium Property, Cochise County, Arizona, USA, phosphohedyphane has been found on the dump associated with jarosite, goethite and quartz (R&M 90.4.344).

At the Brown Monster mine, phosphohedyphane has been found associated with fornacite (MinRec 41.2.189).

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