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| ul·tra·ba·sic [ ùltrə báyssik ] |
adjective |
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| Definition: |
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with high iron content: describes igneous rock that is high in iron and magnesium and contains no free quartz
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noun (plural ul·tra·ba·sics) |
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| Definition: |
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ultrabasic rock: a rock of ultrabasic composition
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[
See also (all senses)ultramafic] |
