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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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Peridotite

Intrusive igneous rock formed within olivine, the source of Peridot

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Pillar

A solid block of rock used to support a mine shaft

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Periodic table

The arrangement of all know elements, natural or manmade, based on density and further grouped by prevalent characteristics where correlations are known to exist

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Pig iron

Usually the first refined iron product from a smelter, subject to further refinement prior to use