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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

The time lapse between volcanic eruptions

Having the shape of a kidney

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

A soft, silvery-white, metal. Symbol, Rb

A loose mass of rock fragments

See Net Smelter Return

A unit of measuring exposure doses of X-ray or gamma radiation

Any natural mineral, alone or in combination

A large pile of boulders and gravel, collected and concentrated by the action of a river or other channel