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Formula: Ca3(AsO4)2.11H2O
Hydrated normal arsenate
Specific gravity: 2.28
Streak: White
Colour: Colourless
Environments
Phaunouxite is often associated with the chemically nearly identical
rauenthalite
(Mindat).
Localities
At the type locality, the Gabe Gottes mine, Sankt Jakob vein, Neuenberg, Ste Marie-aux-Mines, Colmar-Ribeauvillé,
Haut-Rhin, Grand Est, France, phaunouxite is a very rare post-mine low-temperature reaction product of
carbonate gangue with arsenical
solutions. Associated minerals include picropharmacolite,
pharmacolite, sainfeldite,
rauenthalite, ferrarisite,
löllingite, calcite and
aragonite. At room temperature, phaunouxite dehydrates slowly to
rauenthalite
(HOM. AM 68.850).
At the Clara Mine, Oberwolfach, Wolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany, phaunouxite
has been found associated with rauenthalite, both forming mostly white
coatings on a
quartz-fluorite-baryte
matrix. Associated minerals are typically dusserite and
bariopharmacosiderite
(R&M 90-1.46).
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