Bilingual glossary of geology
Ultramafic Ultramafique
A term qualifying the composition of igneous rocks, minerals, or magmas. Utramafic rocks are composed almost entirely of iron and magnesium-rich minerals (mostly pyroxene and olivine), some calcium-rich plagioclase feldspar, and essentially no felsic minerals.
Themes:
Igneous rocks
Related words:
Felsic
Mafic
Intermediate
Themes:
Igneous rocks
Related words:
Felsic
Mafic
Intermediate