igneous
Granite or granitic rock fragment
Granite; primarily quartz (SiO₂), feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse, mottled gray-green and black granular texture with likely interlocking crystals; Mohs hardness about 6–7, vitreous to dull luster, no obvious cleavage as a whole, and specific gravity about 2.6–2.8.
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Physical properties
Coarse, mottled gray-green and black granular texture with likely interlocking crystals; Mohs hardness about 6–7, vitreous to dull luster, no obvious cleavage as a whole, and specific gravity about 2.6–2.8.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in Earth’s crust, generally during Precambrian to Phanerozoic episodes; the exact age cannot be determined from the image.
Uses & applications
Used widely as building stone, countertops, monuments, aggregate, and landscaping material; this small rough fragment has little commercial or jewelry value.
Geological facts
The visible “salt-and-pepper” appearance reflects contrasting light feldspar/quartz and dark biotite or amphibole crystals. Exact identification is limited because the specimen is small and image resolution is low.
Field identification & locations
Common in continental crust and exposed granitic terrains worldwide, including mountain belts and old shields. A hand lens, glass-scratch test, and acid test can help distinguish it from similar diorite or gneiss.
