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How are minerals formed in igneous and metamorphic rocks ?
Minerals form in igneous rock as magma or lava cools. The minerals will form from the available chemicals in the magma as their crystallization temperature is reached. The sequence of mineral crystal formation from magma is described in the Bowen's Reaction Series.

Metamorphic rock minerals are aligned, altered, or recrystallized from existing rock minerals due to the effects of heat or pressure.


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