AM_Protomangano-ferro-anthophyllite Formula: Fe4.699 Mg.901 Mn1.4 Si8 O24 H2 Name: Protomangano-ferro-anthophyllite Unit cell: 9.425 18.303 5.345 90.0 90.0 90.0 , V=922.04 Space group: PNMN (58)

Sueno S , Matsuura S , Gibbs G V , Boisen M B , Physics and Chemistry of Minerals , 25 (1998) p.366-377, A crystal chemical study of protoanthophyllite:, orthoamphiboles with the protoamphibole structure, Sample: PMFA Yokene Mine