igneous
Weathered granite or granitic rock fragment
Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale gray-beige, granular texture with dark mineral flecks, and a dull to slightly vitreous luster. Interlocking crystalline grains and no obvious cleavage as a whole; specific gravity about 2.6–2.7.
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Physical properties
Hardness about 6–7 Mohs; pale gray-beige, granular texture with dark mineral flecks, and a dull to slightly vitreous luster. Interlocking crystalline grains and no obvious cleavage as a whole; specific gravity about 2.6–2.7.
Formation & geological history
A coarse-grained intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, generally over hundreds of millions to billions of years. The rounded surface likely reflects weathering or abrasion.
Uses & applications
Commonly used for building stone, countertops, monuments, aggregate, and landscaping; small ordinary fragments have negligible commercial value.
Geological facts
Granite’s visible grains are typically quartz, potassium feldspar, plagioclase, and minor biotite or hornblende. The image is insufficient for precise identification, and the specimen could also be a weathered felsic rock such as granodiorite.
Field identification & locations
Look for interlocking light grains, glassy gray quartz, pink or white feldspar, and black mica; it should not fizz with dilute acid. Common worldwide, especially in continental mountain belts.
