igneous
Weathered granite
Granite, a coarse-grained felsic intrusive rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectThe specimen appears tan to rusty brown and granular, with pale feldspar/quartz and darker mineral flecks; weathering obscures its texture. Granite typically has Mohs hardness 6–7, a nonmetallic luster, and interlocking crystals without cleavage as a whole rock.
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Physical properties
The specimen appears tan to rusty brown and granular, with pale feldspar/quartz and darker mineral flecks; weathering obscures its texture. Granite typically has Mohs hardness 6–7, a nonmetallic luster, and interlocking crystals without cleavage as a whole rock.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, commonly in continental crust; its age cannot be determined from the image and may range from ancient to geologically recent.
Uses & applications
Granite is widely used for building stone, countertops, paving, and monuments; this small weathered piece is mainly suitable for collecting or study.
Geological facts
The yellow-brown coloring is consistent with iron-bearing minerals oxidizing during weathering, rather than necessarily indicating a distinct mineral species.
Field identification & locations
Look for interlocking grains of quartz and feldspar with scattered dark mica; common worldwide in continental mountain belts and exposed shields. A fresh broken surface would help confirm the identification.
