ULTRAMAFIC

Etymology

Adjective

ultramafic (comparative more ultramafic, superlative most ultramafic)

(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)

A rock with such properties.

Source: Wiktionary

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