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Formula: Ca2Pb3(PO4)3Cl
Anhydrous phosphate with halogen, lead mineral,
hedyphane group,
apatite supergroup
Crystal System: Hexagonal
Specific gravity: 5.92 calculated
Hardness: 4
Streak: White
Colour: Colourless
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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