walpurgite

walpurgite

[wäl′pər‚jīt]
(mineralogy)
Bi4(UO2)(AsO4)2O4·3H2O A wax yellow to straw yellow, triclinic mineral consisting of a hydrated arsenate of bismuth and uranium. Also known as waltherite.
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Walpurgite, a rare bismuth uranium arsenate, occurs together with violet fluorite, topaz and quartz, as small (maximum 1 mm), flat, tabular amber-brown to yellow crystals.