AM_Manganogrunerite_1 Formula: Mn1.899 Fe3.938 Mg1.251 Ca.1 Si7.812 H2 O24 Name: Manganogrunerite Unit cell: 9.63541 18.3403 5.3422 90.0 102.1312 90.0 , V=922.97 Space group: C12/M1 (12)

Reece J J , Redfern S A T , Welch M D , Henderson C M B , McCammon C A , Physics and Chemistry of Minerals , 29 (2002) p.562-570, Temperature-dependent Fe-Mn order-disorder behaviour in amphiboles, Sample: BM40798, T = 100 C, Locality: Langban, Sweden