pyrogenetic minerals

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Minerals which are crystallized from a completely or almost completely anhydrous magma. These minerals, e.g. olivine, pyroxene, and plagioclase, have anhydrous compositions and are some of the first minerals to crystallize from the magma. If the original magma contained a small amount of water in solution, crystallization of pyrogenetic minerals enriches the residual magma in water.

Subjects: Earth Sciences and Geography.

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