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spilite




spilite
A fine-grained, extrusive igenous rock found near volcanoes. The dark-colored rock occurs as pillow lava, which is formed where lava from a volcanic eruption flows into the sea; it often contains cavities formed by gas bubbles. It is a basic rock containing up to 40% silica and more sodium than basalt, the common volcanic rock.


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   • GEOLOGY AND PLANETARY SCIENCE