Nafertisite

General Information: Chemical Formula:Na3(Fe++,Fe+++)6(Ti2Si12O34)(O,OH)7·2(H2O) Composition:(Molecular Weight = 1,530.61 gm)Sodium 4.51 % NaTitanium 6.26 % TiIron 21.89 % FeSilicon 22.02 % SiHydrogen 0.38 % H Oxygen 44.95 % O  Empirical Formula: Na3Fe2+4.5Fe3+1.5Ti2Si12O39.25(OH)1.75·2(H2O) IMA Status:Approved IMA (Dana # Added)Physical Properties: Cleavage:[001] Perfect Color:green or dark grass green. Density:2.7 Diaphaniety:Transparent Hardness:2-3 - Gypsum-Calcite Luster:Vitreous - Silky Streak:whiteMore details...