igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectGray, speckled, and visibly crystalline, with a granular texture and no obvious cleavage. Typical hardness is about 6–7 Mohs; quartz has a vitreous luster, while feldspar and mica are less lustrous.
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Physical properties
Gray, speckled, and visibly crystalline, with a granular texture and no obvious cleavage. Typical hardness is about 6–7 Mohs; quartz has a vitreous luster, while feldspar and mica are less lustrous.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing visible crystals to grow. Granite occurs in continental crust, with ages ranging from ancient Precambrian rocks to much younger intrusions.
Uses & applications
Widely used for building stone, countertops, paving, monuments, and decorative aggregate; attractive pieces may be polished for display.
Geological facts
Its pale minerals are usually quartz and feldspar, while dark flecks are commonly biotite or hornblende.
Field identification & locations
Identify it by its interlocking, speckled crystals and quartz-rich composition; common in continental mountain belts and exposed bedrock. The image appears consistent with granite, though precise identification requires closer examination.
