Karlite

General Information: Chemical Formula:(Mg,Al)6(BO3)3(OH,Cl)4 Composition:(Molecular Weight = 589.17 gm)Magnesium 18.56 % MgAluminum 6.87 % AlBoron 11.01 % B Hydrogen 0.51 % H Chlorine 6.02 % ClOxygen 57.03 % O  Empirical Formula: Mg4.5Al1.5BO33(OH)3Cl IMA Status:Approved IMA 1980Physical Properties: Cleavage:[001] Perfect Color:light green or silky white. Density:2.8 - 2.85, Average = 2.82 Hardness:5.5 - Knife Blade Luster:Silky Streak:whiteMore details...