Granite is typical of a larger family of granitic rocks that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase, with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or ambole minerals, though a few contain almost no dark minerals.
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