Ultrabasic meaning

ŭl'trə-bā'sĭk
Containing magnesium and iron and only a very small amount of silica. Used of igneous rock.
adjective
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Containing magnesium and iron and only a very small amount of silica. Used of igneous rock, and often used interchangeably with ultramafic. Peridotite is an ultrabasic rock.
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(geology) Ultramafic.
adjective
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