Rabejacite

General Information: Chemical Formula:Ca(UO2)4(SO4)2(OH)6·6(H2O) Composition:(Molecular Weight = 1,522.45 gm)Calcium 2.63 % CaUranium 62.54 % U Hydrogen 1.19 % H Sulfur 4.21 % S Oxygen 29.43 % O  Empirical Formula: Ca(UO2)4(SO4)2(OH)6·6(H2O) Environment:Associated with gypsum and other secondary uranium minerals as an alteration product of pitchblende. IMA Status:Approved IMA Locality:Rabejac and Mas d'Alary village a few kilometers from Lodeve, France. Name Origin:Named for the locality.Physical Properties: Cleavage:None Color:yellow or amber yellow. Density:4.1 Diaphaniety:Transparent to Translucent Habits:Acicular - Occurs as needle-like crystals., Nodular - Tuberose forms having irregular protuberances over the surface., Aggregates - Made of numerous individual crystals or clusters. Hardness:3 - Calcite Luminescence:Fluorescent, Short UV=light yellow, Long UV=light yellow. Luster:Vitreous (Glassy) Streak:whiteMore details...

Ca( O2)4(SO4)2(OH)6 6(H2O)