igneous
Granite
Granite, a coarse-grained intrusive felsic rock composed chiefly of quartz and feldspar
AI-generated identification · may be incorrectVisible pale pink and white feldspar, translucent gray quartz, and dark biotite or amphibole; crystals are interlocking, with no layering. Typical hardness is about 6–7 Mohs; luster ranges from glassy quartz to pearly feldspar.
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Physical properties
Visible pale pink and white feldspar, translucent gray quartz, and dark biotite or amphibole; crystals are interlocking, with no layering. Typical hardness is about 6–7 Mohs; luster ranges from glassy quartz to pearly feldspar.
Formation & geological history
Magma cooled slowly beneath the crust, allowing large crystals to form; granites occur in continental crust across a wide range of geological ages. The image appears to show a polished granite surface with a small fragment resting on it.
Uses & applications
Commonly used for countertops, building stone, paving, monuments, and decorative slabs; attractive pieces may be collected.
Geological facts
Granite is identified by its coarse, speckled mix of quartz, feldspar, and dark minerals; it does not fizz with dilute acid. The pictured surface may be commercial decorative granite, but its exact variety cannot be determined from the image.
Field identification & locations
Found in continental mountain belts and shield regions worldwide; check for visible interlocking crystals and hardness, since quartz should scratch glass. The small fragment is not confidently identifiable from the photo alone.
