igneous
Weathered granite outcrop
Granite; predominantly quartz, alkali feldspar, plagioclase, and minor biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, pale gray to pinkish rock with visible interlocking crystals; quartz has Mohs hardness 7, feldspars 6–6.5. Typically vitreous quartz luster, blocky feldspar cleavage, and high durability; overall specific gravity is about 2.63–2.75.
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Physical properties
Coarse-grained, pale gray to pinkish rock with visible interlocking crystals; quartz has Mohs hardness 7, feldspars 6–6.5. Typically vitreous quartz luster, blocky feldspar cleavage, and high durability; overall specific gravity is about 2.63–2.75.
Formation & geological history
A plutonic igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events. Surface weathering has produced the rough, fractured appearance.
Uses & applications
Widely used as building stone, countertops, monuments, paving, aggregate, and landscaping rock; attractive pieces may be collected but are generally low value.
Geological facts
Granite’s large crystals indicate slow underground cooling, while fractures and iron staining commonly develop during uplift and weathering.
Field identification & locations
Identify it by visible quartz and feldspar grains, interlocking texture, and lack of layering or vesicles; common worldwide in continental crust and exposed mountain ranges.
