granite | Composition, Properties, Types, Uses | Britannica
granite, coarse or mediumgrained intrusive igneous rock that is rich in quartz and feldspar; it is the most common plutonic rock of the Earth''s crust, forming by the cooling of magma (silicate melt) at depth. Because of its use as paving block and as a building stone, the quarrying of granite was, at one time, a major industrial activity. Except for tombstones, however, for which there is ...
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