igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectVisible interlocking crystals with a pink-tan and black speckled appearance; quartz and feldspar are Mohs 6–7, mica about 2–3. Typically nonmetallic, with a granular texture and no consistent cleavage as a rock.
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Physical properties
Visible interlocking crystals with a pink-tan and black speckled appearance; quartz and feldspar are Mohs 6–7, mica about 2–3. Typically nonmetallic, with a granular texture and no consistent cleavage as a rock.
Formation & geological history
Crystallized slowly from silica-rich magma deep in the crust, allowing large crystals to grow. Granite forms in continental crust across many geological ages.
Uses & applications
Used in buildings, countertops, monuments, paving, and as a decorative or educational specimen.
Geological facts
The pink grains are likely potassium feldspar; dark grains are commonly biotite or hornblende, with gray quartz also possible.
Field identification & locations
Identify it by its coarse, interlocking crystals and mixture of light minerals with dark flecks; it is widespread in continental mountain belts and exposed cratons. A small common hand specimen is typically worth about $1–$10 USD.
