Akatoreite

General Information: Chemical Formula:(Mn++,Fe++)Al2Si8O24(OH)8 Composition:(Molecular Weight = 853.86 gm)Manganese 4.83 % MnAluminum 6.32 % AlIron 1.64 % FeSilicon 26.31 % SiHydrogen 0.94 % H Oxygen 59.96 % O  Empirical Formula: Mn3+0.75Fe3+0.25Al2Si8O24(OH)8 IMA Status:Approved IMA 1969 Locality:TL: New Zealand, Akatore creek, South IslandPhysical Properties: Cleavage:[010] Perfect Color:orange or brown. Density:3.48 Diaphaniety:Transparent Hardness:6 - Orthoclase Luster:Vitreous (Glassy) Streak:yellow whiteMore details...

Mn9Al2Si8O24(OH)8