Ferropargasite

General Information: Chemical Formula:NaCa2(Fe++4Al)Si6Al2O22(OH)2 Composition:(Molecular Weight = 961.99 gm)Sodium 2.39 % NaCalcium 8.33 % CaAluminum 8.41 % AlIron 23.22 % FeSilicon 17.52 % SiHydrogen 0.21 % H Oxygen 39.92 % O  Empirical Formula: NaCa2Fe2+4Al(Si6Al2O22)(OH)2 IMA Status:Approved IMA 1978Physical Properties: Cleavage:[110] Perfect Color:bluish green, brown, grayish black, or black. Density:3.44 Diaphaniety:Translucent to Subopaque Hardness:5-6 - Between Apatite and Orthoclase Luster:Vitreous (Glassy) Streak:gray whiteMore details...