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A set of nine samples of axinite, selected from 60 specimens from worldwide localities, were investigated by single-crystal X-ray diffraction, electron and ion microprobe, and  57 Fe Mössbauer spectroscopy. The selected samples cover the compositional join from almost pure ferroaxinite (80%) to pure manganaxinite (95%). A new crystal-chemical formula for the axinite mineral group is proposed:  VI [X1 X2 Y Z1 Z2] 2  IV [T1 T2 T3 T4 T5] 2 O 30 (O w OH 1-w ) 2 , where VI and IV are coordination numbers; X1 = Ca and very minor Na; X2 = Ca (in axinites) or Mn (in tinzenite); Y = Mn (in manganaxinite and tinzenite), Fe 2+  (in ferroaxinite) or Mg (in magnesioaxinite), with minor Al and Fe 3+ ; Z1 = Al and Fe 3+ ; Z2 = Al; T1, T2, and T3 = Si; T4 = Si (and presumably very minor B); T5 = B and minor Si. Charge unbalance (w), due to heterovalent substitutions, is compensated for by O 2-  → OH -  substitution.

Site distribution of Fe 2+ and Fe 3+ in the axinite mineral group: New crystal-chemical formula