felsic rocks

Why Are The Basic Igneous Rocks Heavy And Dark In Colour?

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Why Are The Basic Igneous Rocks Heavy And Dark In Colour? Mafic rocks have a relatively low silica content and are composed mostly of pyroxenes, olivines and calcic plagioclase. These rocks (basalt, gabbro) are usually dark coloured, and have a higher density than felsic rocks. Ultramafic rock is very low in silica, with more than

What Is The Difference Between The Composition Of Felsic And Mafic Igneous Rocks?

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What Is The Difference Between The Composition Of Felsic And Mafic Igneous Rocks? What is the difference between a felsic and mafic igneous rock? … Felsic rocks are rich in Silicon, Sodium, and Potassium, while Mafic igneous rocks are rich in Iron, Magnesium, and Calcium. Felsic rocks are lighter in color, whereas Mafic rocks are