Ultramafic meaning

ŭl'trə-măf'ĭk
Ultrabasic.
adjective
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Containing mainly mafic minerals. Used of igneous rocks and often used interchangeably with ultrabasic. Dunite is an ultramafic rock.
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(geology) Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth's mantle.
adjective
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A rock with such properties.
noun
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Origin of ultramafic

  • ultra- +"Ž mafic
    From Wiktionary