Uranopilite is a minor
ore of
uranium with the chemistry (UO2)6SO4(OH)6O2ˑ12H2O or, Hydrated Uranyl Sulfate Hydroxide.As with many uranyl minerals, it is
fluorescent and
radioactive. It is straw yellow in normal light. Uranopilite fluoresces a bright green under
ultraviolet light. Uranopilite contains clusters of six uranyl pentagonal bipyramids that share equatorial edges and vertices, with the clusters cross-linked to form chains by sharing vertices with sulfate tetrahedra. In uranopilite, the chains are linked directly by hydrogen bonds, as well as to interstitial H2O groups.
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General Information:
Chemical Formula:
(UO2)6(SO4)(OH)10·12(H2O)
Composition:
(Molecular Weight = 2,102.49 gm)
Uranium 67.93 %
U Hydrogen 1.63 %
H Sulfur 1.53 %
S Oxygen 28.92 %
O Empirical Formula:
(UO2)6(SO4)(OH)10·12(H2O)
Environment:
Secondary mineral found on altering uraninite.
Locality:
Jachymov, Bohemia, Czech Republic.
Name Origin:
Named for uranium and the Greek for "felt", alluding to the bopositin and habit.
Physical Properties:
Cleavage:
[010] Perfect
Color:
lemon or straw yellow.
Density:
3.7 - 4, Average = 3.85
Habits:
Encrustations - Forms crust-like aggregates on matrix., Reniform - "Kidney like" in shape (e.g.. hematite).,
Luminescence:
Fluorescent, Short UV=bright greenish yellow.
Luster:
Silky
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