igneous
Granite Pebble
Granite (Felsic Intrusive Igneous Rock)
Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper appearance with grey, white, and black specks. Luster: Dull to vitreous. Crystal structure: Phaneritic (visible interlocking crystals of quartz, feldspar, and mica).
- Hardness
- 6-7 on Mohs scale
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper appearance with grey, white, and black specks. Luster: Dull to vitreous. Crystal structure: Phaneritic (visible interlocking crystals of quartz, feldspar, and mica).
Formation & geological history
Formed from the slow cooling and crystallization of silica-rich magma deep underground. This specific specimen is a water-worn pebble likely eroded from a larger batholith and smoothed by river or beach action.
Uses & applications
Used widely in construction (crushed stone), architecture (countertops, monuments), and occasionally polished for use as decorative river stones or in landscaping.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Because of its hardness, it is highly resistant to weathering compared to other rock types.
Field identification & locations
Identify by its 'salt and pepper' grainy texture and hardness (it cannot be scratched by a steel knife). Commonly found in mountain ranges, riverbeds, and glacial deposits.
