igneous
Weathered granite or granitic gneiss
Felsic granitoid; primarily quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse, granular texture with pale gray-white feldspar/quartz and dark mica or amphibole; likely Mohs hardness 6–7, vitreous to dull luster, no obvious cleavage at specimen scale, and specific gravity about 2.6–2.8.
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Physical properties
Coarse, granular texture with pale gray-white feldspar/quartz and dark mica or amphibole; likely Mohs hardness 6–7, vitreous to dull luster, no obvious cleavage at specimen scale, and specific gravity about 2.6–2.8.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep underground, probably during Precambrian to Phanerozoic continental crust formation; surface weathering has roughened and discolored it.
Uses & applications
Common granite is used as crushed stone, aggregate, building stone, countertops, and monuments; small unattractive fragments have little commercial value.
Geological facts
The image is slightly out of focus, so distinguishing granite from gneiss or weathered feldspathic rock is uncertain. Visible light and dark mineral grains support a granitoid identification.
Field identification & locations
Look for interlocking crystals: glassy gray quartz, blocky white or pink feldspar, and black mica; gneiss would show clear mineral banding. Common worldwide, especially in continental shields and mountain belts.
