igneous
Rounded granitic pebble
Granite, composed mainly of quartz, feldspar, and dark mica or amphibole
AI-generated identification · may be incorrectA tan-brown, mottled, rounded pebble with visible light and dark mineral grains; likely Mohs hardness 6–7, vitreous to dull luster, and no consistent cleavage. The image does not show enough detail to confirm its exact mineral composition.
Identified More igneous →
Explore Rounded granitic pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
A tan-brown, mottled, rounded pebble with visible light and dark mineral grains; likely Mohs hardness 6–7, vitreous to dull luster, and no consistent cleavage. The image does not show enough detail to confirm its exact mineral composition.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing crystals to grow. Its age cannot be determined from the photograph; the rounded shape likely results from prolonged abrasion during transport by water or ice.
Uses & applications
Granite is widely used as building and dimension stone, paving, countertops, and aggregate; small rounded pieces are commonly kept as curios or collected.
Geological facts
Granite’s contrasting speckles reflect interlocking minerals that crystallized together. Pebbles like this can be carried far from their source by rivers or glaciers.
Field identification & locations
Look for interlocking grains of pale feldspar and quartz with darker minerals, and a hard surface that resists scratching by steel. Similar pebbles occur in riverbeds, beaches, and glacial deposits worldwide.
