igneous
Weathered granite or granitic pegmatite fragment
Granitic rock, chiefly quartz, feldspar, and mica; exact identification requires testing
AI-generated identification · may be incorrectCoarse, visibly interlocking grains with pink/orange feldspar, gray-white quartz, and dark mica or iron-oxide staining; hardness about 6–7, generally vitreous to dull, with no consistent cleavage as a whole. The rusty brown coloration likely reflects weathering of iron-bearing minerals.
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Physical properties
Coarse, visibly interlocking grains with pink/orange feldspar, gray-white quartz, and dark mica or iron-oxide staining; hardness about 6–7, generally vitreous to dull, with no consistent cleavage as a whole. The rusty brown coloration likely reflects weathering of iron-bearing minerals.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, typically during Precambrian to Phanerozoic intrusive events; the specimen was later exposed and weathered at the surface.
Uses & applications
Common granite is used as crushed stone, building and dimension stone, countertops, monuments, and aggregate; this small weathered fragment has negligible practical or jewelry value.
Geological facts
Granite is identified by its coarse texture and mixture of light quartz/feldspar with dark mica or amphibole. Its exact variety could be pegmatitic, aplite-bearing, or strongly weathered granite.
Field identification & locations
Common worldwide in continental crust, including India, Brazil, North America, Europe, and Australia. A hand lens, streak test, and fresh broken surface help distinguish it from sandstone or altered volcanic rock.
