| FeAl2(PO4)2(OH)2.8H2O
This sample of paravauxite is displayed in the Smithsonian Museum of Natural History. Paravauxite is a phosphate mineral of iron  and aluminum with the composition FeAl2(PO4)2(OH)2.8H2O.  The sample at left is about 12 cm across and is from Llallagua, Potosi, Bolivia.   
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