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ba·salt

basalt

 
pronunciation:
b sawlt
features:
Word Combinations (noun), Word Explorer
part of speech: noun
definition: a dense, fine-grained, dark-colored igneous rock created by lava flow that is rich in minerals containing magnesium and iron. The most common igneous rock on the Earth's surface due to its high abundance on the ocean floor.
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derivation: basaltic (adj.)
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See
  rock, stone, volcano