igneous
Weathered granite
Granite, a quartz–feldspar–mica intrusive igneous rock
AI-generated identification · may be incorrectCoarse, unevenly crystalline, mottled gray-brown with dark mineral grains and possible quartz and feldspar; typical Mohs hardness 6–7, vitreous to dull luster, with no cleavage as a whole rock. Weathering obscures the grains, so identification from the photo is not certain.
Identified More igneous →
Explore Weathered granite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, unevenly crystalline, mottled gray-brown with dark mineral grains and possible quartz and feldspar; typical Mohs hardness 6–7, vitreous to dull luster, with no cleavage as a whole rock. Weathering obscures the grains, so identification from the photo is not certain.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, commonly within continental crust; examples range from ancient Precambrian to much younger intrusions.
Uses & applications
Granite is widely used for building stone, countertops, paving, and monuments; this small weathered piece is mainly suitable for collecting.
Geological facts
Granite is a rock composed of several minerals, rather than a single mineral; iron-bearing minerals can weather to brown tones.
Field identification & locations
Look for interlocking visible quartz and feldspar grains with scattered dark mica or amphibole. It occurs widely in continental mountain belts and exposed cratons; a fresh broken surface would help confirm the identification.
