What are the various types of igneous rocks based on their origin?
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As has already been described, igneous rocks are classified into four categories, based on either their chemistry or their mineral composition: felsic, intermediate, mafic, and ultramafic. ... Intermediate rocks have between 20% and 50% ferromagnesian silicates, and mafic rocks have 50% to 100% ferromagnesian silicates.
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As has already been described , igneous rocks are classified into four categories ,based on either their chemistry or their mineral composition : felsic , intermidiate , magic and ultramafic .
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