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Basalt
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Basalt is a mafic extrusive igneous rock formed from the rapid cooling of magnesium-rich and iron-rich lava exposed at or very near the surface of a terrestrial planet or a moon. More than 90% of all volcanic rock on Earth is basalt.
Rock group: igneous
Main minerals: pyroxenes, olivine, plagioclase
Rock group: igneous
Main minerals: pyroxenes, olivine, plagioclase
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