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Magnesium

A light, silvery-grey and very common metal. Symbol, Mg. Its principal ore is magnesite and dolomite

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Magma

The extremely hot volcanic fluid which forms rock when cooled

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Mafic

Dark igneous rocks typically high in iron and magnesium

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Macro

A prefix meaning large, the opposite of micro

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Malleable

The property of a mineral that can withstand bending, compression and deformation