igneous
Tumbled granite pebble
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectPink-brown with scattered pale grains and a smooth, rounded, polished surface. Granite’s constituent minerals have Mohs hardnesses of about 2–7; its texture and overall hardness vary with composition.
Identified More igneous →
Explore Tumbled granite pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Pink-brown with scattered pale grains and a smooth, rounded, polished surface. Granite’s constituent minerals have Mohs hardnesses of about 2–7; its texture and overall hardness vary with composition.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing crystals to grow; granite occurs in ancient continental crust and is found worldwide.
Uses & applications
Used as dimension stone, countertops, paving, and decorative aggregate; small polished pieces are sold as curios or craft stones.
Geological facts
The photo shows a small polished pebble, so its exact rock type cannot be confirmed from appearance alone.
Field identification & locations
A speckled mix of light and dark mineral grains is typical of granite; quartz grains are hard and feldspar commonly appears pink or cream. Common sources include granite outcrops and glacial or stream deposits.
