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Porphyritic Texture

Igneous Rock Textures

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Rocks with porphyritic ("POR-fi-RIT-ic") texture like this andesite have larger mineral grains, or phenocrysts ("FEEN-o-crists"), in a matrix of smaller grains.
Big grains in a fine matrix
Photo (c) 2007 Andrew Alden, licensed to About.com (fair use policy)
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