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Permafrost

A depth of the earth’s surface or subsurface which is permanently frozen.

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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

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Piezoelectricity

The property exhibited by certain crystalline mineral such as quartz and tourmaline which, subjected to shock, produce a negative and positive electrically polarized end at either end of the crystal

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Pentlandite

Likely the most common nickel bearing ore, Nickel iron sulphide, (Fe,Ni)9S8