igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectVisible interlocking gray-white, pinkish, and dark mineral grains; typically Mohs 6–7, with a vitreous quartz luster and no overall cleavage. Individual crystals have varied structures and cleavage.
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Physical properties
Visible interlocking gray-white, pinkish, and dark mineral grains; typically Mohs 6–7, with a vitreous quartz luster and no overall cleavage. Individual crystals have varied structures and cleavage.
Formation & geological history
Forms when silica-rich magma cools slowly beneath the surface, allowing large crystals to grow. Granite occurs in continental crust of many geological ages.
Uses & applications
Used as dimension stone, paving and building material, countertops, monuments, and landscaping stone.
Geological facts
Granite’s speckled appearance comes from its mixture of light quartz and feldspar with darker minerals such as biotite or hornblende.
Field identification & locations
Identify by its coarse, interlocking grains and lack of layering; common in continental mountain belts and exposed ancient crust. This specimen appears granite-like, though a photo cannot confirm its exact mineral makeup.
