Delindeite

General Information: Chemical Formula:(Na,K)3(Ba,Ca)4(Ti,Fe,Al)6Si8O26(OH)4 Composition:(Molecular Weight = 1,530.89 gm)Potassium 1.92 % K Barium 26.91 % BaSodium 3.38 % NaCalcium 2.62 % CaTitanium 11.26 % TiAluminum 1.06 % AlIron 6.57 % FeSilicon 14.68 % SiHydrogen 0.26 % H Oxygen 31.35 % O  Empirical Formula: Na2.25K0.75Ba3CaTi3.6Fe3+1.8Al0.6Si8O26(OH)4 IMA Status:Approved IMA 1987Physical Properties: Cleavage:[???] Good Color:gray pink. Density:3.3 Diaphaniety:Translucent Luster:Pearly Streak:whiteMore details...