University of Colorado

Mineral Structure and Property Data

Uraninite Group

The Uraninite group is composed of the fluorite-structure di-oxide minerals of uranium and thorium (thorianite)

The crystal structure of uraninite. 

                Uraninite   Thorianite  
                UO2         ThO2     


Form.Wt.        270.03      264.04 
Z               4           4     
CrystalSystem   Cub         Cub  
PointGroup      m3m         m3m 
SpaceGroup      Fm-3m       Fm-3m

UnitCell
a(Å)            5.4682      5.5997
Vol(Å3)         162.51      175.59

MolarVol        24.620      26.439
Density         10.968      9.987

Thermal Expansion(Volumetric)
alpha           24.5
a0              0.2180
a1              1.2446
a2              -0.0920

Elastic Properties
Ks(GPa)         209.       
G(Gpa)           83.

Mineral Data Base Index

GEOL 3010 Syllabus

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