igneous
Weathered granitic rock fragment
Likely granite or granodiorite; exact identification is uncertain from the image
AI-generated identification · may be incorrectSmall, rounded, tan-brown and visibly granular, with interlocking mineral grains and a dull, weathered surface. Likely contains quartz, feldspar, and dark mica; constituent minerals have Mohs hardnesses of about 2–7.
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Physical properties
Small, rounded, tan-brown and visibly granular, with interlocking mineral grains and a dull, weathered surface. Likely contains quartz, feldspar, and dark mica; constituent minerals have Mohs hardnesses of about 2–7.
Formation & geological history
If granitic, it crystallized slowly from magma underground, probably millions to billions of years ago, and was later exposed and rounded by weathering or transport.
Uses & applications
A fragment this size has little industrial or jewelry value; similar rock is used as building stone, aggregate, and decorative landscaping material.
Geological facts
Granite-family rocks are coarse-grained intrusive igneous rocks; iron staining from weathering can give feldspar-rich surfaces a brown color.
Field identification & locations
Look for interlocking grains and visible light quartz or feldspar alongside darker minerals; a close-up or fresh broken surface would help distinguish granite from other rocks. Granitic rocks occur widely in continental crust worldwide.
