igneous
Weathered granitic rock fragment
Likely granite or granodiorite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectCoarse, irregular gray rock with visible pale feldspar/quartz and dark mica or amphibole; typically Mohs 6–7, vitreous to dull luster, no consistent cleavage as a whole, and specific gravity about 2.6–2.8.
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Physical properties
Coarse, irregular gray rock with visible pale feldspar/quartz and dark mica or amphibole; typically Mohs 6–7, vitreous to dull luster, no consistent cleavage as a whole, and specific gravity about 2.6–2.8.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events; surface weathering produced its rough texture.
Uses & applications
Used extensively as crushed aggregate, dimension stone, paving, monuments, and countertops; this small fragment has negligible commercial value unless from a notable locality.
Geological facts
Granite is an intrusive igneous rock whose interlocking crystals make it durable and resistant to abrasion. Exact identification would require a fresh surface, hand lens, and possibly mineral or chemical testing.
Field identification & locations
Common worldwide, especially in continental shields and mountain belts. Look for interlocking light quartz/feldspar grains with scattered dark minerals; estimated value is $0–$5 as an ordinary specimen, or roughly $5–$20 if unusually attractive or locality-labeled.
