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Pellet

A small globular piece of fused metal or metals, usually 1 cm. in diameter

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Pegmatite

An igneous rock, similar to granite, having a coarse irregular texture. Pegmatites are a common host of minerals and specifically a priority target for well formed crystal minerals such as corundum and tourmaline

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Peat moss

Any type of moss which has formed on peat as its substrate

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Peat

An accumulated mass of decayed or partially decayed plant matter

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Pick

A T-shaped, hand mining tool which has a wooden or plastic handle fitted in the centre of a steel head with sharp points on either side.

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Photon

The single particle, which in a group are responsible for electromagnetic radiation of all wavelengths, including gamma rays, x-rays, light, microwave energy, and radio waves

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Phosphorescence

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