ultramafic

English

Etymology

ultra- +‎ mafic

Adjective

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.

Synonyms

• ultrabasic

Noun

ultramafic (plural ultramafics)

1. A rock with such properties.