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زمینشناسی و معدن::
مافیک
Granitic (Felsic) Versus Basaltic (Mafic) Compositions Despite their great compositional diversity, igneous rocks (and the magmas from which they form) can be divided into broad groups according to their proportions of light and dark minerals (see Figure 4.5).
Basaltic rocks contain a high percentage of ferromagnesian minerals, so geologists also refer to them as mafic (from magnesium and ferrum, the Latin name for iron).
Because of their iron content, mafic rocks are typically darker and denser than granitic rocks.
This unmelted chunk of dark (mafic) rock was incorporated into a granitic magma, eastern Sierra Nevada, Rock Creek Canyon, California.
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