General Information:
Chemical Formula:UO2
Composition:(Molecular Weight = 270.03 gm)Uranium 88.15 %
U Oxygen 11.85 %
O Empirical Formula: UO2
Environment:Granite and syenite pegmatites. Colloform crusts in high temperature hydrothermal veins. In quartz-pebble conglomerates.
IMA Status:Approved IMA 1962
Locality:Southern parts of the Canadian Precambrian Shield, Bancroft, Ontario. New Hampshire, USA. Transvaal gold-bearing conglomerates.
Name Origin:From its elemental composition containing uranium.
Physical Properties: Cleavage:[???] Good
Color:brownish black, gray, grayish black, or black.
Density:6.5 - 10.95, Average = 8.72
Diaphaniety:Nearly opaque
Habits:Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Dendritic - Branching "tree-like" growths of great com plexity (e.g. pyrolusite).
Hardness:5-6 - Between Apatite and Orthoclase
Luminescence:Non-fluorescent.
Luster:Sub Metallic
Streak:brownish black
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