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Radiolaria

Marine protozoa subject to silica replacement fossilization sound in limestone, shale and other rocks

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Radioactivity

Alpha, beta or gamma energy emitted by the decay of atomic nuclei from their radioactive source

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Radium

A trace radioactive element, symbol, Ra. It occurs in uranium ores

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Representative sample

Samples large enough to contain a similar percentage of mineral constituents of the host rocks from which it was removed

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Replacement ore

Rocks transformed by the replacement of eroded or precipitated minerals, by the introduction of newly deposited minerals and while retaining a high percentage of its original form

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Relief

Another term for the shape of the earth surface at a specific point

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Regolith

The layer of rocks, gravel, sand, soil and other matter between surface and bedrock