Axinite Al 2%, B 1%, Ca 2%, Fe 1%, Mn 1%, estimated elemental composition and molecular weight  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) = 255.71 Minerals may vary in elemental composition and impurity levels. The formula given is an approximation. Wikipedia Page: Axinite is defined with respect to the entities below: The entities below are defined with respect to: Axinite Mineral (generic) chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis