Web Reference: The mafic magmas are somewhat more viscous than the ultramafic magmas, but they are still fairly fluid. Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. Apr 5, 2024 · What is the main difference between ultramafic and mafic rocks? The main difference lies in their silica content and mineral composition, with ultramafic rocks having less silica and a higher proportion of mafic minerals. Mafic rocks are low in silica, in the 45-50% range. Ultramafic refers to the extremely mafic rocks composed of mostly olivine and some pyroxene which have even more magnesium and iron and even less silica.
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