igneous
Weathered granite (probable)
Granite; a quartz–feldspar-rich intrusive igneous rock
AI-generated identification · may be incorrectCoarse, granular tan-brown surface with darker mineral flecks; likely quartz, feldspar, and mica or amphibole. Typical granite hardness is about 6–7 Mohs, with interlocking crystals and no consistent cleavage; weathering obscures grain detail here.
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Physical properties
Coarse, granular tan-brown surface with darker mineral flecks; likely quartz, feldspar, and mica or amphibole. Typical granite hardness is about 6–7 Mohs, with interlocking crystals and no consistent cleavage; weathering obscures grain detail here.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, commonly within continental crust. Its age cannot be determined from the image; granites occur from Archean time to the present.
Uses & applications
Granite is widely used as building and dimension stone, paving, countertops, and decorative aggregate; this small weathered piece is mainly a teaching or collection specimen.
Geological facts
The tan color may result from iron staining or weathered feldspar, rather than the rock’s original fresh color.
Field identification & locations
Look for visible interlocking quartz and feldspar grains, often with dark mica; a fresh broken surface would help confirm granite. Similar rocks are common in continental mountain belts and exposed plutons.
