Hydrated normal arsenate, bismuth and uranium mineral
Specific gravity: 6.69
Colour: Yellow, orange-yellow; colourless to light yellow in transmitted light.
Walpurgite is a rare secondary mineral in the oxidised
zone of bismuth-uranium-arsenic-bearing
hydrothermal mineral deposits.
At the type locality, the Weißer Hirsch Mine, Neustädtel, Saxony, Germany, walpurgite is associated with trögerite, zeunerite, uranosphaerite, uranospinite and torbernite (Mindat, HOM).
At Joachimsthal, Bohemia, Czech Republic, walpurgite is associated with torbernite (AM 28: 521).
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