Ferrobarroisite

General Information: Chemical Formula:[](CaNa)Fe++3AlFe+++Si7AlO22(OH)2 Composition:(Molecular Weight = 923.02 gm)Sodium 2.49 % NaCalcium 4.34 % CaAluminum 5.85 % AlIron 24.20 % FeSilicon 21.30 % SiHydrogen 0.22 % H Oxygen 41.60 % O  Empirical Formula: CaNaFe2+3AlFe3+(Si7AlO22)(OH)2 IMA Status:Approved IMA 1978Physical Properties: Color:green. Hardness:5-6 - Between Apatite and OrthoclaseMore details...

NaCa(Fe,Mg)3Al2(Si7Al)O22(OH)2