igneous
Granite-like rock
Likely weathered granite or granitic gneiss; exact identification is uncertain from the photograph
AI-generated identification · may be incorrectLight gray to tan, coarse granular texture with visible interlocking mineral grains and dull luster; likely quartz, feldspar, and mica. Typical hardness is about 6–7 Mohs, with no obvious cleavage as a whole rock and specific gravity around 2.6–2.7.
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Physical properties
Light gray to tan, coarse granular texture with visible interlocking mineral grains and dull luster; likely quartz, feldspar, and mica. Typical hardness is about 6–7 Mohs, with no obvious cleavage as a whole rock and specific gravity around 2.6–2.7.
Formation & geological history
Formed by slow cooling of silica-rich magma deep underground, commonly during Precambrian to Phanerozoic continental crust formation; surface weathering rounded the specimen.
Uses & applications
Commonly used as crushed stone, aggregate, building stone, monuments, and countertops; this small weathered piece has little jewelry value.
Geological facts
Granite is an aggregate of minerals rather than a single mineral, and its individual grains can often be scratched only by harder materials such as quartz or steel.
Field identification & locations
Look for interlocking light feldspar, translucent-gray quartz, and dark mica; distinguish it from sandstone by its crystalline texture and from gneiss by the absence of clear mineral banding. Common worldwide in continental mountain belts and exposed shields.
