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Phosphorescence

The residual emission of absorbed energy in the form of light by a substance, following exposure to incident radiation

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Phaneritic

A term for igneous rocks having a texture of grainy crystal visible to the naked eye

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Phase

The sum of homogenous material within a larger heterogeneous material body

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Pipe

A vertical body of rock formed from lava and debris moving directly upward

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Pore

A vacant space, hole or cavity in rock or soil

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Porcelain clay

A clay substance, such as kaolinite, suitable for use in the manufacture of porcelain