MnFe₂(PO₄)₂ (OH)₂.6H₂O

This sample of strunzite is displayed in the Smithsonian Museum of Natural History. Strunzite is a phosphate mineral of iron and manganese. It has the composition MnFe₂(PO₄)₂(OH)₂.6H₂O. This sample is about 8 cm wide and is from Hagendorf, Bayern, Germany.