igneous
Granite
Phaneritic plutonic igneous rock (SiO2 rich)
Hardness: 6-7 (Mohs scale); Color: tan, pink, and white with dark flecks; Luster: Vitreous to dull; Structure: Coarse-grained (phaneritic); Composition: Quartz, Feldspar, and Mica/Amphibole.
- Hardness
- 6-7 (Mohs scale)
- Color
- tan, pink, and white with dark flecks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: tan, pink, and white with dark flecks; Luster: Vitreous to dull; Structure: Coarse-grained (phaneritic); Composition: Quartz, Feldspar, and Mica/Amphibole.
Formation & geological history
Formed from the slow crystallization of magma below the Earth's surface during the Precambrian to Cenozoic eras. It forms in continental crust at subduction zones and mountain-building regions.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability.
Geological facts
Granite is one of the most common rocks on the Earth's continental crust. El Capitan in Yosemite National Park is one of the world's most famous granitic monoliths.
Field identification & locations
Identified in the field by its 'salt and pepper' appearance and visible interlocking crystals. Common in mountain ranges and glacial deposits. Resists scratching by steel.
