igneous
Granite (likely weathered, quartz-rich granite)
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectGray-brown, speckled, and rough with visible mineral grains; quartz has Mohs hardness 7, feldspars about 6, and mica 2–3. Granite has an interlocking crystalline texture and no consistent cleavage; the small, weathered specimen makes precise identification uncertain.
Identified More igneous →
Explore Granite (likely weathered, quartz-rich granite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Gray-brown, speckled, and rough with visible mineral grains; quartz has Mohs hardness 7, feldspars about 6, and mica 2–3. Granite has an interlocking crystalline texture and no consistent cleavage; the small, weathered specimen makes precise identification uncertain.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing crystals to grow; granites occur across a wide range of geological ages.
Uses & applications
Used as building and paving stone, countertops, monuments, and aggregate; attractive pieces may be collected, though this small rough specimen has little commercial value.
Geological facts
Granite’s mix of light quartz and feldspar with darker mica or other minerals gives it its characteristic speckled appearance.
Field identification & locations
Look for interlocking grains and a mix of light and dark minerals; quartz should scratch glass, while granite does not fizz with dilute acid. Granite occurs widely in continental crust, but the image alone cannot confirm the exact rock type or locality.
