Sklodowskite

General Information: Chemical Formula:(H3O)2Mg(UO2)2(SiO4)2·4(H2O) Composition:(Molecular Weight = 858.63 gm)Magnesium 2.83 % MgUranium 55.44 % U Silicon 6.54 % SiHydrogen 1.64 % H Oxygen 33.54 % O  Empirical Formula: (H3O)2Mg(UO2)2(SiO4)2·4(H2O) Locality:Kasolo, Katanga, Congo.Physical Properties: Cleavage:[100] Perfect Color:greenish yellow or light yellow. Density:3.54 Diaphaniety:Translucent to subtranslucent Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., , Hardness:2-3 - Gypsum-Calcite Luminescence:Radioactive. Luster:Vitreous (Glassy) Streak:yellow whiteMore details...

(H3O)2Mg( O2)2(SiO4)2 4(H2O)