Uranospinite

General Information:
 Chemical Formula:
Ca(UO2)2(AsO4)2·10(H2O)
 Composition:
(Molecular Weight = 1,038.12 gm)
Calcium 3.86 % Ca
Uranium 45.86 % U 
Arsenic 14.43 % As
Hydrogen 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 % Na
Calcium 1.05 % Ca
Uranium 49.98 % U 
Arsenic 15.73 % As
Hydrogen 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
More details...