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زمینشناسی و معدن::
اولترامافیک
Because peridotite is composed almost entirely of ferromagnesian minerals, its chemical composition is referred to as ultramafic.
Although ultramafic rocks are rare at Earth's surface, peridotite is the main constituent of the upper mantle.
Typically, the silica content of crustal rocks ranges from a low of about 40 percent in ultramafic rocks to a high of morethan 70 percent in felsic rocks (see Figure 4.5).
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