igneous
Granite (likely)
Coarse-grained felsic intrusive igneous rock, principally quartz and feldspar with dark mica or amphibole
AI-generated identification · may be incorrectSmall, rough, mottled black-and-white specimen with visible interlocking grains; likely Mohs hardness 6–7, vitreous quartz and feldspar luster, no regular cleavage as a whole, and specific gravity around 2.6–2.7. Exact mineral identification is uncertain from the image alone.
Identified More igneous →
Explore Granite (likely) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Small, rough, mottled black-and-white specimen with visible interlocking grains; likely Mohs hardness 6–7, vitreous quartz and feldspar luster, no regular cleavage as a whole, and specific gravity around 2.6–2.7. Exact mineral identification is uncertain from the image alone.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing crystals to grow; it occurs in continental crust and spans a wide range of geological ages.
Uses & applications
Used as dimension stone, countertops, paving, monuments, and decorative aggregate; small pieces are also collected.
Geological facts
Its contrasting light and dark grains commonly reflect quartz and feldspar mixed with biotite or hornblende.
Field identification & locations
Look for a hard, speckled rock with interlocking visible crystals; it will not fizz in dilute acid. Common worldwide in exposed continental mountain belts and quarries.
