igneous
Granite Pebble
Granite (felsic intrusive igneous rock)
AI-generated identification · may be incorrectHardness: 6-7 on Mohs scale; Color: mottled pink, white, cream, and dark brown/gray; Luster: vitreous to dull; Crystal structure: phaneritic (interlocking granular crystalline texture); Specific gravity: ~2.6-2.7
- Hardness
- 6-7 on Mohs scale
- Color
- mottled pink, white, cream, and dark brown/gray
- Luster
- vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: mottled pink, white, cream, and dark brown/gray; Luster: vitreous to dull; Crystal structure: phaneritic (interlocking granular crystalline texture); Specific gravity: ~2.6-2.7
Formation & geological history
Formed through slow crystallization of felsic, silica-rich magma deep underground within the continental crust, followed by uplift, weathering, and rounding by water transport in a river or marine environment.
Uses & applications
In bulk form used widely in construction, dimension stone, countertops, and aggregate. Polished or smooth pebbles are used for landscaping, decorative accents, and rock tumbling.
Geological facts
Granite makes up the majority of the Earth's continental crust. Over millions of years, quartz and feldspar crystals in granite resist intense erosion, often surviving as rounded river pebbles.
Field identification & locations
Identifiable by its visible interlocking multi-colored grains—typically pink orthoclase feldspar, milky/translucent quartz, and dark biotite or hornblende flecks. Abundant along riverbeds, gravel bars, and coastlines worldwide.
