igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectMottled gray-brown with visible interlocking grains, likely quartz, feldspar, and dark mica or amphibole. Typical hardness is about 6–7 Mohs; crystals are granular, with no prominent cleavage as a whole rock, and specific gravity around 2.6–2.7.
Identified More igneous →
Explore Granite pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mottled gray-brown with visible interlocking grains, likely quartz, feldspar, and dark mica or amphibole. Typical hardness is about 6–7 Mohs; crystals are granular, with no prominent cleavage as a whole rock, and specific gravity around 2.6–2.7.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing visible crystals to grow. Granite occurs in continental crust and ranges widely in age, from ancient Precambrian bodies to younger intrusions.
Uses & applications
Granite is widely used for building stone, countertops, paving, and crushed aggregate; small rounded specimens are commonly collected or used decoratively.
Geological facts
Its contrasting mineral grains reflect slow cooling and crystallization at depth.
Field identification & locations
The rounded shape suggests water or other abrasion during transport. Look for a hard, speckled texture with interlocking light quartz/feldspar and darker minerals; the exact identification is uncertain from the photo alone.
