igneous
Weathered granite or granitic rock fragment
Granite; chiefly quartz, feldspar, and mica (composition uncertain from image)
AI-generated identification · may be incorrectCoarse, mottled tan-brown texture with apparent quartz/feldspar grains and low-to-moderate vitreous luster; likely Mohs hardness about 6–7. No obvious cleavage at specimen scale; granular crystalline structure and typical granite density around 2.6–2.7 g/cm³.
Identified More igneous →
Explore Weathered granite or granitic rock fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, mottled tan-brown texture with apparent quartz/feldspar grains and low-to-moderate vitreous luster; likely Mohs hardness about 6–7. No obvious cleavage at specimen scale; granular crystalline structure and typical granite density around 2.6–2.7 g/cm³.
Formation & geological history
Formed by slow cooling and crystallization of silica-rich magma deep within Earth’s crust, commonly during Precambrian to Phanerozoic intrusive events; brown coloration likely reflects iron-oxide weathering.
Uses & applications
Used widely as dimension stone, countertops, monuments, aggregate, and construction material; this small weathered fragment has little commercial value but may be a teaching or collecting specimen.
Geological facts
Granite’s visible grains indicate it cooled slowly underground rather than erupting at the surface. Surface oxidation can turn originally gray or pink feldspar-rich granite brown.
Field identification & locations
Common in continental mountain belts and exposed batholiths worldwide, including India, Brazil, Canada, Scandinavia, and the United States. Field identification relies on interlocking visible quartz and feldspar grains, unlike glassy volcanic rocks.
