AM_Manganogrunerite_5 Formula: Mn1.9 Fe3.94 Mg1.248 Ca.1 Si7.812 H2 O24 Name: Manganogrunerite Unit cell: 9.67027 18.3656 5.34465 90.0 101.9899 90.0 , V=928.50 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 = 400 C, Locality: Langban, Sweden