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Igneous and Metamorphic Rocks

Igneous and Metamorphic Rocks

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Texture of <strong>Igneous</strong> <strong>Rocks</strong><br />

• Glassy: caused by rapid cooling; no crystals<br />

• Pyroclastic: fragments of glass <strong>and</strong> crystals;<br />

volcanic ash <strong>and</strong> bombs<br />

• Aphanitic: microscopic crystals<br />

• Phaneritic: macroscopic crystals<br />

• Porphyritic: grains of two distinct sizes; can<br />

occur in phaneritic or aphanitic matrix

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