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Alkalic

Rocks which contain above average amounts of sodium and/or potassium for the group of rocks for which it belongs. For example, the basalts of the capping stage of Hawaiian volcanoes are alkalic. They contain more sodium and/or potassium than the shield-building basalts that make the bulk of the volcano.

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  • Part of Speech: noun
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  • Industry/Domain: Earth science
  • Category: Geology
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