ultramafic

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[edit] English

[edit] Etymology

ultra- +‎ mafic

[edit] Adjective

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Wikipedia

ultramafic (comparative more ultramafic, superlative most ultramafic)

  1. (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.

[edit] Synonyms

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