igneous
Weathered granite or granitic gneiss fragment
Felsic granitoid, chiefly quartz, feldspar, and biotite/hornblende
AI-generated identification · may be incorrectCoarse, granular texture with pink-tan feldspar, gray translucent quartz, and dark mafic grains; vitreous quartz luster and uneven fracture. Typical hardness is about 6–7 Mohs, with no prominent cleavage as a whole rock; density commonly 2.6–2.8 g/cm³.
Identified More igneous →
Explore Weathered granite or granitic gneiss fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, granular texture with pink-tan feldspar, gray translucent quartz, and dark mafic grains; vitreous quartz luster and uneven fracture. Typical hardness is about 6–7 Mohs, with no prominent cleavage as a whole rock; density commonly 2.6–2.8 g/cm³.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic intrusive events; surface weathering produced the brown oxidation staining.
Uses & applications
Used as building stone, aggregate, monuments, and decorative dimension stone; this small weathered fragment has little commercial or jewelry value.
Geological facts
The image shows a rounded, iron-stained specimen with visible interlocking grains, but the exact rock name cannot be confirmed without a fresh surface or thin section.
Field identification & locations
Identify it by its interlocking pink feldspar, gray quartz, and dark mica/amphibole grains; granite is widespread in continental crust worldwide. A fresh broken face and hand lens help distinguish it from weathered sandstone or gneiss.
