Aphanitic, phaneritic and porphyritic are textural terms which

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These textural terms describe the size of the crystals in igneous rocks, which are related to the cooling rates and environments of the magma or lava from which the rocks form. Aphanitic textures are fine-grained, indicating rapid cooling typically associated with volcanic eruptions. Phaneritic textures are coarse-grained, indicating slow cooling usually found in plutonic environments. Porphyritic textures have a mix of coarse and fine grains, indicating a complex cooling history that can involve both deep (plutonic) and surface (volcanic) environments.

Aphanitic, Phaneritic and Porphyritic Are Textural Terms Which