ultramafic
English edit
Etymology edit
Adjective edit
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 edit
Noun edit
ultramafic (plural ultramafics)
- A rock with such properties.