Images Formula: (Ca,K,Na)xMn6(Si,Al)10O24(OH)4.nH2O (x = 1-2; n = 7-11) Valence: (Ca,K,Na)xMn2+6(Si,Al)10O24(OH)4.nH2O (x = 1-2; n = 7-11) Back to Minerals