General Information:
Chemical Formula:Ca(UO2)2(AsO4)2·10(H2O)
Composition:(Molecular Weight = 1,038.12 gm)Calcium 3.86 %
CaUranium 45.86 %
U Arsenic 14.43 %
AsHydrogen 1.94 %
H Oxygen 33.91 %
O Empirical Formula: CaUO22(AsO4)2·10(H2O)
Environment:Alteration product of uraninite.
Locality:Weisser Hirsch mine, Neustadtl, Schneeberg, Saxony, Germany.
Name Origin:Named for uranium and the Greek for "siskin," in allusion to its composition and color.
Physical Properties: Cleavage:[001] Perfect, [100] Distinct
Color:siskin green, lemon yellow, or yellow green.
Density:3.45
Diaphaniety:Transparent
Habits:Platy - Sheet forms (e.g. micas)., Aggregates - Made of numerous individual crystals or clusters.,
Hardness:2-3 - Gypsum-Calcite
Luminescence:Fluorescent, Long UV=yellowish green.
Luster:Pearly
Streak:light yellow
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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 - Pearly
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