Definitions from Wikipedia (Ultramafic rock)
▸ noun: Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are usually composed of greater than 90% mafic minerals (dark colored, high magnesium and iron content).
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▸ noun: Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are usually composed of greater than 90% mafic minerals (dark colored, high magnesium and iron content).
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▸ Usage examples for Ultramafic rock
▸ Idioms related to Ultramafic rock
▸ Wikipedia articles (New!)
▸ Words that often appear near Ultramafic rock
▸ Rhymes of Ultramafic rock
▸ Invented words related to Ultramafic rock