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Igneous Rock Textures

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Ophitic

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Ophitic texture is found in dolerites where pyroxene surrounds and encloses plagioclase feldspar, signifying a slower rate of cooling that allows pyroxene crystals to envelop the earlier-formed feldspar.

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Phaneritic

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Phaneritic texture features coarse grains, indicating that the rock crystallized slowly from magma deep underground.

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Equigranular

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Equigranular texture has minerals that are roughly the same size, suggesting a uniform rate of cooling and crystallization.

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Frothy

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Frothy texture is characterized by a high volume of vesicles, like in pumice, indicating extremely rapid cooling with high gas content and facilitates floating on water.

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Aphanitic

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Aphanitic texture is characterized by fine grains that cooled quickly on or near the Earth's surface, often too small to see with the naked eye.

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Glassy

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Glassy texture forms when magma cools so rapidly that atoms cannot arrange into a crystal structure, resulting in a non-crystalline material like obsidian.

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Pyroclastic

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Pyroclastic texture consists of fragmented material due to explosive volcanic eruptions; these fragments can be volcanic ash, pumice, or lava bombs.

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Pegmatitic

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Pegmatitic texture contains extremely large crystals, forming in environments with abundant water that allows elements to travel and crystallize easily.

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Porphyritic

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Porphyritic texture displays large crystals (phenocrysts) embedded in a matrix of smaller crystals (groundmass), indicating a complex cooling history.

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Vesicular

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Vesicular texture is marked by many cavities or bubbles (vesicles) caused by gas trapped in the lava during the rapid cooling of an extrusive eruption.

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