igneous
Weathered granite
Granite, a coarse-grained intrusive felsic igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectGray, pink, and dark mineral grains with a rough, granular texture; quartz is Mohs 7, feldspars about 6, and mica 2–3. Interlocking crystals have no preferred cleavage at the rock scale; exact composition is difficult to confirm from the photo.
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
Gray, pink, and dark mineral grains with a rough, granular texture; quartz is Mohs 7, feldspars about 6, and mica 2–3. Interlocking crystals have no preferred cleavage at the rock scale; exact composition is difficult to confirm from the photo.
Formation & geological history
Magma cooled slowly underground, allowing visible crystals to grow; granite occurs in crustal bodies of many geological ages. The specimen’s rusty, rough surface likely reflects weathering.
Uses & applications
Granite is widely used as dimension stone, paving, aggregate, and countertops; this small rough piece is mainly a collector specimen.
Geological facts
The pink grains are likely feldspar, the gray translucent-looking grains may be quartz, and dark grains may be mica or other ferromagnesian minerals.
Field identification & locations
Look for a speckled mix of interlocking light and dark crystals and a hard, quartz-bearing texture; common worldwide in continental crust and exposed mountain belts.
