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Plutonic

Refers to rocks from plutons transported from great depth

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Pluton

An intrusive igneous body, usually measured in kilometers

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Plug

A small offshoot of solid lava from a larger flow

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Pleochroism

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

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Portland cement

A calcium-aluminum silicate mineral combined with aggregate and water to form concrete

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Pyrite

A yellow iron sulphide mineral, FeS2. Referred to as “fool’s gold”

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Porphyry copper

Disseminated copper ore which occurs in fractures and veins in stockwork veins, formed through precipitation of hydrothermal solutions