igneous
Weathered granitic rock fragment
Likely granite or granodiorite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectHardness about 6–7 Mohs; tan-brown, granular texture, dull to slightly vitreous luster, and no obvious cleavage as a whole. Visible grains likely include pale feldspar, gray quartz, and dark mica or altered minerals; specific gravity is approximately 2.6–2.8.
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Physical properties
Hardness about 6–7 Mohs; tan-brown, granular texture, dull to slightly vitreous luster, and no obvious cleavage as a whole. Visible grains likely include pale feldspar, gray quartz, and dark mica or altered minerals; specific gravity is approximately 2.6–2.8.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, producing interlocking crystals; the brown coloration likely reflects surface weathering and iron oxidation. Its exact geological age cannot be determined from the photograph.
Uses & applications
Commonly used as dimension stone, building aggregate, paving material, and landscape rock; this small weathered fragment has negligible commercial or jewelry value.
Geological facts
Granite is an intrusive igneous rock whose coarse crystals indicate slow cooling at depth. Weathering commonly turns feldspar-rich surfaces tan, yellow, or rusty brown.
Field identification & locations
Identify it by its visibly interlocking coarse grains and mixed light/dark minerals; a fresh broken surface should show quartz and feldspar more clearly. Granite and granodiorite occur widely in continental mountain belts and exposed batholiths.
