igneous
Granite Pebble
Felsic intrusive igneous rock (consisting primarily of Quartz and Feldspar)
Hardness: 6-7 on Mohs scale. Color: Mottled pink, white, and grey with black specks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, though polished here). Cleavage: None (fractures irregularly). Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled pink, white, and grey with black specks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled pink, white, and grey with black specks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, though polished here). Cleavage: None (fractures irregularly). Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specific specimen has been water-worn and smoothed in a river or beach environment. Likely formed during various Orogenic events throughout Earth's history.
Uses & applications
Used widely in construction (countertops, flooring), monuments, and as decorative landscaping stones or aggregate.
Geological facts
Granite makes up a large portion of the Earth's continental crust. El Capitan in Yosemite National Park is one of the most famous granite monoliths in the world.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and hardness (cannot be scratched by a steel knife). Commonly found in mountain ranges and glacial deposits.
