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Pillow lava

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About Pillow lavaHide

A morphological description rather than a rock species, but included here because of its importance.

Pillow lava forms where lava erupts into water - most notably mid-ocean ridges and marine hotspot volcanoes, but they can also be formed by eruptions into fresh water.

Mostly basaltic in composition, but andesite, komatiite, picrite, boninite, basaltic andesite, andesite, dacite and even rhyolite pillow lavas are known.

They form as the lava cools on contact with water to form a lobe with a thin glassy skin, which then expands until the pressure of lava forces the skin to break allowing the lava to escape and start a new lobe, or pillow.

Classification of Pillow lavaHide

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