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Home » Minerals » Uraninite


Mineral Properties and Uses

What is Uraninite?

Uraninite is an oxide of uranium. It occurs in granite pegmatites, occasionally in hydrothermal veins, and less often in sandstones. It is the primary ore of uranium. It has a very high specific gravity and is radioactive. Uraninite is also known as "pitchblende".

Physical Properties of Uraninite

Chemical Classification oxide
Color brownish black to black
Streak brownish black, grayish
Luster submetallic to pitchlike
Diaphaneity opaque
Cleavage none
Mohs Hardness 5 to 6
Specific Gravity 6.5 to 10.0
Diagnostic Properties radioactivity, color, luster, specific gravity, lack of cleavage
Chemical Composition Uranium Oxide , UO2
Crystal System isometric
Uses primary ore of uranium, used to prepare fuel for nuclear reactors

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