Kaersutite

General Information: Chemical Formula:NaCa2(Mg4Ti)Si6Al2O23(OH)2 Composition:(Molecular Weight = 872.72 gm)Sodium 2.63 % NaCalcium 9.18 % CaMagnesium 11.14 % MgTitanium 5.49 % TiAluminum 6.18 % AlSilicon 19.31 % SiHydrogen 0.23 % H Oxygen 45.83 % O  Empirical Formula: NaCa2Mg4Ti(Si6Al2O23)(OH)2 IMA Status:Approved IMA 1978Physical Properties: Cleavage:[110] Perfect Color:dark brown or black. Density:3.2 - 3.28, Average = 3.24 Diaphaniety:Translucent to Subopaque Hardness:5-6 - Between Apatite and Orthoclase Luster:Vitreous - Resinous Streak:brownish grayMore details...

NaCa2(Mg,Fe)4Ti(Si6Al2)O22(OH)2