ultramafic

Fetched 2026-10-26 (cache).

Synonyms: ultrabasic

Antonyms: ultrabasic

Related words from Datamuse; suggestions, not definitions.

Adjective

1. {{lb|en|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]].

Noun

1. A rock with such properties.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.