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Pleochroism

The property of a mineral where the colour of grains vary with angle observed

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Plasma

Its own state of matter, apart from gases, solids and liquids with equal amounts of positively and negatively charged particles

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Placer

A deposit containing target minerals such as gold, platinum, diamonds and other gemstone found in loose or loosely compacted soil, sand or gravel

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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