Igneous rock having lower silica content than basic rock
Igneous rock having lower silica content than basic rock
An extremely dense, radioactive, metallic element. Symbol, U
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