igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale. Color: Light grey, white, with black flecks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Specific gravity: 2.63 - 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Light grey, white, with black flecks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Light grey, white, with black flecks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Specific gravity: 2.63 - 2.75.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. It is an intrusive rock found in continental crust and can be hundreds of millions to billions of years old.
Uses & applications
Widely used in construction (countertops, flooring, monuments), aggregate for road base, and as a decorative stone in landscaping.
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 exposed granite monoliths in the world.
Field identification & locations
Identify by its interlocking 'salt and pepper' appearance of quartz (clear/grey), feldspar (white/pink), and mica (black/shiny). Extremely common in mountain ranges and Canadian Shield areas.
