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Aphanitic

An aphanite is an igneous rock with a fine-grained structure. The individual crystals are too small to see with the unaided eye.

Aphanites are commonly porphyrites, having large crystals embedded in the fine groundmass. The large inclusions are called phenocrysts.

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Aphanitic".