UO2Cubic
Uraninite
UO2
OxidesChemical FormulaUO2
Crystal SystemCubic
Mohs Hardness6
Specific Gravity10.97
ColorBlack to brownish black
LusterSubmetallic to vitreous
StreakBrownish black, greenish
CleavageNone
FractureConchoidal to uneven
Occurrence
Primary ore of uranium. Also known as pitchblende. Radioactive.