Alluaudite

FeMn_1.911Na_1.896O₁₂P₃

Hatert, F.Long, G. J.Hautot, D.Fransolet, A.-M.Delwiche, J.Hubin-Franskin M JGrandjean, F.

Physics and Chemistry of Minerals (2004) 31, 487-506

a=12.048Å   b=12.623Å   c=6.511Å

α=90°   β=114.58°   γ=90°