An extremely dense, radioactive, metallic element. Symbol, U
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Category: <span>U</span>
An ore of uranium, chiefly comprised of uranium oxide, U02
A coarse irregular fracture in rock
The removal of minerals conducted through a series of underground shafts and tunnels
A layer of loose, unclassed particles
Igneous rock composed of mafic minerals
Igneous rock having lower silica content than basic rock