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ultramafic
ul·tra·maf·ic U0010950 (ŭl′trə-măf′ĭk)adj. Ultrabasic.ultramafic (ˌʌltrəˈmæfɪk) adj (Geological Science) geology (of igneous rock) composed of a very high percentage of magnesium and ironultramafic
ultramafic[¦əl·trə′maf·ik] (petrology) Referring to igneous rock composed principally of mafic minerals, such as olivine and pyroxene. |