different between ultramafic vs troctolite

English

ultra- +? mafic

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.

ultramafic (plural ultramafics)

From German Troktolit

troctolite (usually uncountable, plural troctolites)

(geology) A rare type of ultramafic intrusive rock, consisting primarily of olivine and calcic plagioclase

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