igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectGray-white with visible sparkling grains, likely quartz, feldspar, and mica; hard (about 6–7 Mohs), nonmetallic luster, interlocking crystals, and no regular cleavage as a whole rock.
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Physical properties
Gray-white with visible sparkling grains, likely quartz, feldspar, and mica; hard (about 6–7 Mohs), nonmetallic luster, interlocking crystals, and no regular cleavage as a whole rock.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing large crystals to grow; granite occurs in continental crust and spans many geological ages. The rounded shape likely results from transport or weathering.
Uses & applications
Granite is widely used as building stone, paving, countertops, and decorative aggregate; this small pebble is mainly suitable for collecting or decoration.
Geological facts
The pale grains are likely quartz and feldspar, while dark flecks may be biotite or other accessory minerals.
Field identification & locations
Identify it by its coarse, interlocking light and dark mineral grains and high hardness; granite is common worldwide, especially in continental mountain belts and exposed batholiths.
