igneous
Weathered granite fragment
Granite, a quartz–feldspar plutonic rock
AI-generated identification · may be incorrectThe specimen appears tan and granular, possibly containing quartz and feldspar; the photo does not show enough detail to confirm its minerals or texture. Granite is typically Mohs 6–7, with a crystalline structure and no cleavage as a whole rock.
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Physical properties
The specimen appears tan and granular, possibly containing quartz and feldspar; the photo does not show enough detail to confirm its minerals or texture. Granite is typically Mohs 6–7, with a crystalline structure and no cleavage as a whole rock.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing visible crystals to grow; its age depends on the source and cannot be determined from the image.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and decorative aggregate.
Geological facts
Granite commonly contains quartz, alkali feldspar, and plagioclase, with smaller amounts of mica or other minerals.
Field identification & locations
A granular, interlocking mix of light and dark crystals suggests granite; inspect a fresh surface with a hand lens to distinguish it from sandstone or other tan rocks. Granite occurs worldwide in continental crust.
