AM_Manganogrunerite_10 Formula: Mn1.897 Fe3.938 Mg1.199 Ca.1 Si7.812 H2 O24 Name: Manganogrunerite Unit cell: 9.68509 18.3886 5.34607 90.0 101.872 90.0 , V=931.74 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 = 600 C, Locality: Langban, Sweden