A trace radioactive element, symbol, Ra. It occurs in uranium ores
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Tag: <span>R</span>
Marine protozoa subject to silica replacement fossilization sound in limestone, shale and other rocks
Lines converging at a single center
Alpha, beta or gamma energy emitted by the decay of atomic nuclei from their radioactive source
Ore whose minerals resist separation by initial chemical processes and require further chemical decomposition
The percentage of valuable minerals successfully recovered in ore
An initial exploration and ground survey of mineral lands
The closing and rehabilitation of a mine back to its original or natural state
An ore or arsenic, Arsenic monosulfide.
A heavy, dense, rare element of the platinum group. Symbol, Rh