igneous
Weathered granite pebble
Granite, a coarse-grained felsic intrusive igneous rock; likely quartz, feldspar, and minor dark minerals
AI-generated identification · may be incorrectSmall rounded pebble with a yellow-orange, rusty-weathered surface and scattered dark specks. Granite typically has interlocking crystals, Mohs hardness about 6–7, and no cleavage as a whole rock; the image does not show enough detail to confirm grain size or composition.
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Physical properties
Small rounded pebble with a yellow-orange, rusty-weathered surface and scattered dark specks. Granite typically has interlocking crystals, Mohs hardness about 6–7, and no cleavage as a whole rock; the image does not show enough detail to confirm grain size or composition.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing quartz and feldspar to crystallize. Granite ranges from Precambrian to geologically recent; the pebble’s specific age and source cannot be determined from the photo.
Uses & applications
Granite is widely used as building stone, paving, monuments, and aggregate; this small specimen is mainly suitable for collecting or display.
Geological facts
Orange-brown staining commonly results from iron-bearing minerals weathering to iron oxides. The rounded shape suggests abrasion during transport in water or sediment.
Field identification & locations
Look for visible interlocking grains, especially glassy quartz and pale feldspar; a fresh broken surface is more diagnostic than this weathered exterior. Granite pebbles occur in river gravel, beaches, and glacial deposits.
