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'''Basic rocks''' are [[igneous rock]]s that contain between 45% and 55% total [[silica]]. These have less than 10% [[quartz]] and are rich in [[ferro-magnesian mineral]]s.
'''Basic rocks''' are [[igneous rock]]s that contain between 45% and 55% total [[silica]]. These have less than 10% [[quartz]] and are rich in [[ferro-magnesian mineral]]s.
==Sources==
==Sources==