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Induced polarization

A method of geophysical surveying utilizing electrical currents and conductivity readings to outline or pinpoint areas of mineralization

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Indicator

A geological or biological feature or other mineral that suggests the presence of a specific mineral within its environment

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Index fossil

A fossil used to determine the surrounding rock based on the likely time of its origin

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Inclusion

A fragment of other rock contained or enclosed within a host rock

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Intrusive

A body of rock formed within another rock by the consolidation of magma intruded into other igneous rocks. Dissimilar to lava, which extrudes upon the surface.

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Isotope

A form of the same element containing a different number of neutrons in its nucleus, giving that element characteristic properties and atomic weight

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Irradiation

Radiation that ionizes matter, rather than passing through it or reflecting from it