igneous
Granite
Granite (Felsic Intrusive Igneous Rock)
Hardness: 6-7 Mohs; Color: Pink, gray, or white with darker minerals; Luster: Dull to phaneritic (visible crystals); Structure: Granular/Crystalline; Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, gray, or white with darker minerals
- Luster
- Dull to phaneritic (visible crystals)
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, gray, or white with darker minerals; Luster: Dull to phaneritic (visible crystals); Structure: Granular/Crystalline; Specific Gravity: 2.63-2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. Found in continental crust, often appearing in mountain ranges or cratons, spanning all geological eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stone, monuments, and as crushed stone for road base and concrete aggregate.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is extremely durable and has been used for famous structures like the Great Pyramids and Mount Rushmore.
Field identification & locations
Identify by its 'salt and pepper' appearance with large, visible crystals of quartz (clear/gray), feldspar (pink/white), and mica (black/shiny). Extremely common worldwide.
