igneous
Weathered granitic rock fragment
Likely granite or granodiorite, composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, irregular fragment with pale gray/tan color, glassy quartz, light feldspar, and dark mica or weathering products; likely Mohs hardness 6–7, nonmetallic luster, and no obvious cleavage as a whole rock.
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Physical properties
Coarse-grained, irregular fragment with pale gray/tan color, glassy quartz, light feldspar, and dark mica or weathering products; likely Mohs hardness 6–7, nonmetallic luster, and no obvious cleavage as a whole rock.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep underground, commonly during Precambrian to younger continental crust formation; surface weathering produced the rough, brown-stained exterior.
Uses & applications
Common granite is used as crushed aggregate, building stone, countertops, monuments, and landscaping material; this small fragment has negligible commercial value.
Geological facts
The visible mixed grain sizes and interlocking texture are characteristic of intrusive igneous rocks. Brown patches may represent iron-oxide staining or weathered biotite rather than a separate mineral.
Field identification & locations
Identify it by its visible interlocking quartz–feldspar–mica grains, lack of layering, and inability to fizz strongly in dilute acid; a close inspection or fresh broken surface would distinguish granite from granodiorite.
