Eakerite

General Information: Chemical Formula:Ca2SnAl2Si6O18(OH)2·2(H2O) Composition:(Molecular Weight = 779.38 gm)Calcium 10.28 % CaAluminum 6.92 % AlSilicon 21.62 % SiTin 15.23 % SnHydrogen 0.78 % H Oxygen 45.16 % O  Empirical Formula: Ca2SnAl2Si6O18(OH)2·2(H2O) IMA Status:Approved IMA 1970 Name Origin:Name after Easton, Pennsylvania, USA.Physical Properties: Cleavage:None Color:colorless or white. Density:2.93 Diaphaniety:Transparent Hardness:5.5 - Knife Blade Luster:Vitreous (Glassy) Streak:whiteMore details...