Ultramafic Rock
Ultramafic (also referred to as ultrabasic) rocks are igneous and meta-igneous rocks with very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark colored, high magnesium and iron content). The Earth's mantle is composed of ultramafic rocks.
Read more about Ultramafic Rock: Intrusive Ultramafic Rocks, Volcanic Ultramafic Rocks, Ultrapotassic Ultramafic Rocks, Metamorphic Ultramafic Rocks, Distribution in Space and Time, Soil and Regolith Developed On Ultramafic Rock
Famous quotes containing the word rock:
““O what unlucky streak
Twisting inside me, made me break the line?
What was the rock my gliding childhood struck,
And what bright unreal path has led me here?””
—Philip Larkin (1922–1986)