Tatarskite

General Information: Chemical Formula:Ca6Mg2(SO4)2(CO3)2Cl4(OH)4·7(H2O) Composition:(Molecular Weight = 795.36 gm)Calcium 30.23 % CaMagnesium 6.11 % MgHydrogen 2.28 % H Carbon 3.02 % C Sulfur 8.06 % S Oxygen 50.29 % O  Empirical Formula: Ca6Mg2(SO4)2(CO3)2(OH)4·7(H2O) Environment:Found in a drill core of marine evaporite deposits. IMA Status:Approved IMA 1963 Locality:Caspian Depression, Kazakhstan. Name Origin:Named for Vitalii Borisovich Tatarskii (1907-), Russian mineralogist, Leningrad University.Physical Properties: Cleavage:[???] Fair, [???] Fair Color:colorless or light yellow. Density:2.341 Diaphaniety:Transparent Habits:Crystalline - Coarse - Occurs as well-formed coarse sized crystals., , Hardness:2.5 - Finger Nail Luster:Vitreous - Pearly Streak:whiteMore details...

Ca6Mg2(SO4)2(CO3)2Cl4(OH)4 7(H2O)