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What causes large crystals in intrusive igneous rocks?

April 26, 2017causes crystals igneous intrusive large rocks

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What causes large crystals in intrusive igneous rocks?

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Intrusive igneous rock is formed underground by the slow cooling of magma. With the insulating and heat retention effects of an underground environment, ions are free to move about the fluid magma and join onto growing mineral crystals. In a quick cooling environment, crystallization occurs rapidly, with little time for crystal growth.