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Pronunciation varies by accent · adjective
(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..
Use ultramafic when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ultramafic means (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..
Common synonyms include ultrabasic.
The opposite depends on the specific sense.
Use ultramafic where its definition matches the intended context.
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