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