Definitions for "Ultramafic"
A term used to describe igneous rocks or magmas that are rich in iron and magnesium and very poor in silica.
refers to a rock type consisting of almost entirely iron and magnesium silicate minerals with little quartz or feldspar minerals
A term applied to rocks that are extremely mafic or olivine-rich such as peridotite.
Keywords:  ultrabasic, see
See Ultrabasic.