| Mn5(PO3OH)(PO4)2.4H2O
This sample of hureaulite is displayed in the Smithsonian Museum of Natural History. Hureaulite is a phosphate mineral of manganese with the composition Mn5(PO3OH)(PO4)2.4H2O. The sample at left is about 12 cm across and is from Hagendorg pegmatite, Waidhaus, Bayern, Germany.
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