igneous
Weathered granitic rock fragment
Granite, likely quartz–feldspar–biotite aggregate
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale gray to cream, coarse crystalline texture, and vitreous to dull luster. Interlocking quartz and feldspar grains are visible, with dark mica or amphibole; no obvious cleavage as a whole rock.
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Physical properties
Hardness about 6–7 Mohs; pale gray to cream, coarse crystalline texture, and vitreous to dull luster. Interlocking quartz and feldspar grains are visible, with dark mica or amphibole; no obvious cleavage as a whole rock.
Formation & geological history
Formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic continental plutonism, then exposed and weathered at the surface.
Uses & applications
Used extensively as crushed aggregate, road base, concrete and asphalt material, building stone, monuments, and decorative landscaping rock; this small weathered fragment has negligible commercial value.
Geological facts
Granite is not a single mineral but a rock dominated by quartz and feldspar, with accessory mica, amphibole, and iron oxides. Its granular texture records slow underground cooling.
Field identification & locations
Identify it by its speckled, interlocking grains and abundant light quartz/feldspar; a streak, acid, or hand-lens test can help distinguish it from concrete. Common worldwide in continental mountain belts and exposed plutons.
