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gabbro vs. basalt

[ gab-roh ]
noun,
  1. a dark granular igneous rock composed essentially of labradorite and augite.
[ buh-sawlt, bas-awlt, bey-sawlt ]
noun
  1. the dark, dense igneous rock of a lava flow or minor intrusion, composed essentially of labradorite and pyroxene and often displaying a columnar structure.