igneous
Weathered granite or granitic gneiss
Granite; chiefly quartz, feldspar, and mica (possibly weakly foliated gneiss)
AI-generated identification · may be incorrectCoarse, granular gray-beige rock with pinkish weathering, likely quartz and feldspar plus dark mica; hardness about 6–7 Mohs, vitreous to dull luster, no obvious cleavage as a whole, and typical specific gravity 2.6–2.7.
Identified More igneous →
Explore Weathered granite or granitic gneiss in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, granular gray-beige rock with pinkish weathering, likely quartz and feldspar plus dark mica; hardness about 6–7 Mohs, vitreous to dull luster, no obvious cleavage as a whole, and typical specific gravity 2.6–2.7.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep underground, commonly during Precambrian to younger continental mountain-building events; gneiss forms if that granite is later subjected to intense heat and pressure.
Uses & applications
Used as crushed stone, road aggregate, building stone, monuments, and landscaping; attractive polished pieces may have modest decorative value.
Geological facts
The image does not show clear mineral grains or foliation, so exact identification is provisional; surface weathering obscures the texture.
Field identification & locations
Look for interlocking visible quartz, pink/white feldspar, and black mica; a streak test is unhelpful, while quartz should scratch glass and the rock should not fizz with dilute acid. Common worldwide in continental shields and mountain belts.
