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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