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- Coarse-grained igneous rock dominated by light-colored
minerals,
consisting of about 50 percent orthoclase, 25
percent quartz, and balance of plagioclase
feldspars and
ferromagnesian silicates. Granites and
granodiorites comprise 95 percent of all
intrusive rocks.
Source: Leet, L. Don. 1982.
Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- a. A plutonic rock in which quartz constitutes 10% to 50% of the felsic
components and in which the alkali feldspar/total feldspar ratio is
generally restricted to the range of 65% to 90%. Rocks in this range of
composition are scarce, and sentiment has been growing to expand the
definition to include rocks designated as adamellite or quartz monzonite,
which are abundant in the United States. AGI
b. Broadly applied, any holocrystalline, quartz-bearing plutonic rock.
Syn: granitic rock
c. Commercial granite. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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