igneous
Weathered granitic rock fragment
Granite, likely quartz–feldspar–biotite aggregate
AI-generated identification · may be incorrectHardness about 6–7 Mohs; tan to brown, granular texture, dull to weakly vitreous luster, and no obvious cleavage as a whole. Visible grains are consistent with quartz and feldspar, possibly with dark mica or iron-oxide staining; exact identification is limited by the blurry image.
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Physical properties
Hardness about 6–7 Mohs; tan to brown, granular texture, dull to weakly vitreous luster, and no obvious cleavage as a whole. Visible grains are consistent with quartz and feldspar, possibly with dark mica or iron-oxide staining; exact identification is limited by the blurry image.
Formation & geological history
Coarse granite crystallizes slowly from silica-rich magma deep within continental crust, commonly during Precambrian to Phanerozoic mountain-building events, then reaches the surface through uplift and erosion.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and building material; small ordinary fragments have negligible commercial value.
Geological facts
Granite is an intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase, with accessory mica or amphibole.
Field identification & locations
Look for interlocking visible crystals and a pink, gray, white, or brown speckled appearance; it will not fizz with dilute hydrochloric acid and typically scratches glass. Common worldwide in continental shields and mountain belts.
