igneous
Likely weathered granite or granitic pebble
Granite; primarily quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse, speckled gray-brown texture with visible light and dark mineral grains; likely Mohs hardness 6–7, vitreous to dull luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.7.
Identified More igneous →
Explore Likely weathered granite or granitic pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, speckled gray-brown texture with visible light and dark mineral grains; likely Mohs hardness 6–7, vitreous to dull luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.7.
Formation & geological history
Granite forms when silica-rich magma slowly crystallizes deep underground, commonly during Precambrian to younger continental mountain-building events. This specimen appears naturally weathered and rounded by transport.
Uses & applications
Common granite is used for aggregate, building stone, monuments, countertops, and landscaping; small ordinary pebbles generally have negligible commercial value.
Geological facts
The visible dark grains are likely biotite or hornblende, while pale grains are feldspar and quartz. Exact identification is limited because the specimen is small and the image lacks a fresh broken surface.
Field identification & locations
Look for interlocking, millimeter-scale grains: glassy gray quartz, blocky white or pink feldspar, and black mica. Common worldwide, especially in continental shields and mountain belts.
