Magnesiogedrite

General Information: Chemical Formula:(Mg,Fe++)5Al2Si6Al2O22(OH)2 Composition:(Molecular Weight = 847.05 gm)Magnesium 8.61 % MgAluminum 12.74 % AlIron 13.19 % FeSilicon 19.89 % SiHydrogen 0.24 % H Oxygen 45.33 % O  Empirical Formula: Mg3Fe2+2Al2(Si6Al2O22)(OH)2 IMA Status:Discredited IMA 1998 Name Origin:Named for its composition and the original gederite location at Heas Valley, Gedres, France. IMA amphibole commission recommends abandoning this species name.Physical Properties: Cleavage:[???] Good Color:gray white. Hardness:5-6 - Between Apatite and Orthoclase Streak:whiteMore details...