Why are igneous rocks hard and compact.
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Hornblende (5-6) and Pyroxene minerals (5-6) are the main minerals in mafic basalts and gabbros. So, the minerals in igneous rocks have a moderately high hardness and so igneous rocks themselves tend to be quite hard. They get even hard if they become a metamorphic rock.
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When magma crystallizes under Earth's surface, it produces intrusive igneous rock with large crystals. When lava crystallizes above Earth's surface, it produces extrusive igneous rock with crystals that are too small to see. Igneous rocks are very hard and made of interlocking crystals
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