Orthowalpurgite

General Information: Chemical Formula:(UO2)Bi4O4(AsO4)2·2(H2O) Composition:(Molecular Weight = 1,483.82 gm)Uranium 16.04 % U Bismuth 56.34 % BiArsenic 10.10 % AsHydrogen 0.27 % H Oxygen 17.25 % O  Empirical Formula: (UO2)Bi4O4(AsO4)2·2(H2O) Environment:May have formed by weathering of emplectite, wittichenite or other Bi-bearing ore minerals. Dimorphous with walpugite. IMA Status:Approved IMA Locality:The Schmiedestollen, Wittichen, Black Forest, Germany. Name Origin:It is an orthorhombic polymorph of walpurgite.Physical Properties: Cleavage:[001] Indistinct Color:pale yellow. Density:6.5 Diaphaniety:Transparent Habits:Tabular - Form dimensions are thin in one direction., Crystalline - Fine - Occurs as well-formed fine sized crystals., Hardness:4.5 - Between Fluorite and Apatite Luminescence:Non-fluorescent. Luster:Adamantine Streak:pale yellowMore details...