Hydrated normal arsenate
Specific gravity: 2.28
Phaunouxite is often associated with the chemically nearly identical
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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