walpurgite
noun
wal·pur·gite
wälˈpərˌjīt,
wȯl-,
-ˌgīt
plural -s
: a mineral Bi4(UO2)(AsO4)2O4.3H2O(?) consisting of a hydrous bismuth uranium arsenate and oxide occurring in thin yellow crystals
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Merriam-Webster unabridged
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