igneous
Weathered granite or granitic pebble
Granite; primarily quartz (SiO₂), feldspar, and mica/amphibole
AI-generated identification · may be incorrectSmall, rounded, gray-beige, granular specimen with dark mineral flecks and dull-to-subvitreous luster. Granite is typically Mohs 6–7, has interlocking crystals, no prominent cleavage as a rock, and specific gravity about 2.63–2.75.
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Physical properties
Small, rounded, gray-beige, granular specimen with dark mineral flecks and dull-to-subvitreous luster. Granite is typically Mohs 6–7, has interlocking crystals, no prominent cleavage as a rock, and specific gravity about 2.63–2.75.
Formation & geological history
A coarse-grained intrusive igneous rock crystallized slowly from felsic magma, generally during Precambrian to Phanerozoic continental episodes; this piece was later weathered and rounded by erosion.
Uses & applications
Commonly used as crushed stone, aggregate, building stone, paving, and monuments; attractive polished granite is also used for countertops and decorative objects. This small fragment has negligible commercial value.
Geological facts
The pale grains are likely feldspar and quartz, while darker grains may be biotite or hornblende. Strong surface weathering can make granite appear rusty, tan, or crumbly.
Field identification & locations
Identify it by visible interlocking light and dark grains, lack of layering, and hardness sufficient to scratch glass; a hand lens helps distinguish quartz from feldspar. Common worldwide, especially in continental shields and mountain belts.
