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Download Igneous rocks
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Classifying Igneous Rocks Mineral Composition ⢠The three main groups of igneous rocksâfelsic, mafic, and intermediateâare classified according to their mineral compositions. â Felsic rocks, such as granite, are light-colored and have high silica contents. â Mafic rocks, such as gabbro, are dark-colored, have lower silica contents, and are rich in iron and magnesium. â Intermediate rocks, such as diorite, have some characteristics of both felsic and mafic rocks.