igneous
Granite-like rock fragment
Likely leucocratic granite or granitic pegmatite; exact identification requires a fresh surface and mineral testing.
AI-generated identification · may be incorrectCoarse, granular texture with pale feldspar/quartz and darker mafic specks; generally Mohs 6–7, vitreous-to-dull luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.7.
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Physical properties
Coarse, granular texture with pale feldspar/quartz and darker mafic specks; generally Mohs 6–7, vitreous-to-dull luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.7.
Formation & geological history
Formed by slow cooling and crystallization of silica-rich magma deep in the crust, typically during Precambrian to Phanerozoic intrusive events; the fragment may be weathered or artificially broken.
Uses & applications
Granite is widely used for countertops, monuments, building stone, aggregate, and decorative objects; small unexceptional fragments have little commercial value.
Geological facts
The pale matrix likely contains quartz and potassium/plagioclase feldspar, while dark grains may be biotite or amphibole. The image is insufficient to distinguish granite from weathered pegmatite or another felsic intrusive rock.
Field identification & locations
Look for interlocking visible crystals, quartz that does not scratch with a steel knife, and feldspar cleavage; a streak test is generally unhelpful. Common worldwide in continental mountain belts and exposed batholiths.
