Iron phosphate Fe 3 O 8 P 2 .H2O 8      Minerals with the same name may vary widely in appearance and composition, and very few are >99% (reagent grade) pure. Gram formula weight (molecular mass) = 501.64 Minerals may vary in elemental composition and impurity levels. Wikipedia Page: Iron phosphate is defined with respect to the entities below: The entities below are defined with respect to: Iron phosphate Mineral (generic) chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis