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Formula: Ca2Pb3(AsO4)3Cl
Anhydrous arsenate containing halogen,
hedyphane group,
apatite supergroup
Crystal System: Hexagonal
Specific gravity: 5.82 measured
Hardness: 4½
Streak: White
Colour: White, yellow-white, bluish
Solubility: Soluble in nitric acid
Environments:
Metamorphic environments
Hydrothermal environments
Hedyphane is a relatively rare secondary arsenate found in metamorphosed manganese deposits.
At Långban, Värmland, Sweden (the type locality), hedyphane occurs filling fissures in a
garnet-pyroxene matrix
(Mindat),
associated with baryte, barylite,
rhodonite,
hausmannite, bixbyite-(Mn),
phlogopite, amphibole and
calcite (HOM, AM 69.920-927). Specimens have been found consisting of
massive, calcite-bearing rock, coated with
calcite crystals. These are, in turn, coated with hedyphane
crystals,
followed by sparse amounts of allactite and two generations of
hausmannite
(AM 69.920-927).
At Pajsberg, Värmland, Sweden, hedyphane occurs with tephroite and
calcite in magnetite
(Dana).
At Franklin, New Jersey, USA, hedyphane is the most abundant non-silicate lead mineral, associated with
barylite,
calcite, willemite,
native copper, native lead,
hancockite,
rhodonite, baryte,
axinite-(Mn), apatite and
cahnite
in veinlets in a metamorphosed zinc orebody (Dana, HOM). In some
specimens hedyphane is the chief mineral,
forming the matrix for the other species; in others calcite encloses
the other minerals (AM 10.351). Specimens of hedyphane from the Parker Shaft, Franklin mine, contain
hedyphane
associated with axinite,
grossular and
hancockite
(AM 12.180).
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