Zippeite

General Information: Chemical Formula:K4(UO2)6(SO4)3(OH)10·4(H2O) Composition:(Molecular Weight = 2,306.88 gm)Potassium 6.78 % K Uranium 61.91 % U Hydrogen 0.79 % H Sulfur 4.17 % S Oxygen 26.35 % O  Empirical Formula: K4(UO2)6(SO4)3(OH)10·4(H2O) Environment:Common in underground uranium mines. Locality:Jachymov (St. Joachimsthal), Bohemia, Czech Republic. Name Origin:Named for Franz Xaver Maxmillian Zippe (1791-1863), Austrian mineralogist.Physical Properties: Cleavage:[???] Perfect Color:yellow, golden yellow, orange red, or reddish brown. Density:3.66 Diaphaniety:Transparent to Translucent Habits:Pulverulent - Forms a loose, poorly-coherent powdery mass., Encrustations - Forms crust-like aggregates on matrix., Hardness:2 - Gypsum Luminescence:Fluorescent and radioactive, Short UV=bright yellow, Long UV=bright yellow. Luster:Earthy (Dull) Streak:yellow whiteMore details...

General Information: Chemical Formula:(Ni,Co)As3-x Composition:(Molecular Weight = 246.05 gm)Cobalt 5.99 % CoNickel 17.89 % NiArsenic 76.12 % As Empirical Formula: Ni0.75Co0.25As2.5 Locality:SIPhysical Properties: Color:gray, tin white, or gray. Density:6.5 Diaphaniety:Opaque Habits:Massive - Uniformly indistinguishable crystals forming large masses., Crystalline - Fine - Occurs as well-formed fine sized crystals., Granular - Generally occurs as anhedral to subhe dral crystals in matrix. Hardness:5.5-6 - Knife Blade-Orthoclase Luminescence:Non-fluorescent. Luster:MetallicMore details...

General Information: Chemical Formula:(Na2,Ca)(UO2)2(AsO4)2·5(H2O) Composition:(Molecular Weight = 952.47 gm)Sodium 3.62 % NaCalcium 1.05 % CaUranium 49.98 % U Arsenic 15.73 % AsHydrogen 1.06 % H Oxygen 28.56 % O  Empirical Formula: Na1.5Ca0.25(UO2)2(AsO4)2·5(H2O)Physical Properties: Color:green, lemon yellow, or straw yellow. Density:3.846 Diaphaniety:Transparent to Translucent Hardness:2.5 - Finger Nail Luster:Vitreous - PearlyMore details...

General Information: Chemical Formula:(Zn,Cu,Fe++)SO4·7(H2O) Composition:(Molecular Weight = 286.05 gm)Zinc 13.72 % ZnIron 1.95 % FeCopper 6.66 % CuHydrogen 4.93 % H Sulfur 11.21 % S Oxygen 61.52 % O  Empirical Formula: Zn0.6Cu0.3Fe2+0.1(SO4)·7(H2O)Physical Properties: Cleavage:[???] Perfect, [???] Distinct Color:green, yellowish green, or apple green. Density:2.02 Diaphaniety:Transparent to Translucent Hardness:2 - Gypsum Luminescence:Non-fluorescent. Luster:Vitreous (Glassy)More details...