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Definition of granite

i. A coarse grained, holocrystalline, felsic, acidic, 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 [glossary item missing] or quartz monzonite, which are more abundant in the United States. Variety of: granitoid

Ref: AGI

ii. Broadly applied, any coarse grained, holocrystalline, quartz-bearing plutonic rock, but preferable terms are: granitic rock and granitoid

iii. Synonym of Commercial granite, a term used broadly by stonemasons for any hard, crystalline rock suitable for use as a building or ornamental stone (compare with Commercial Marble, which stonemasons use for softer stone.

Ref: AGI


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