igneous
Granite
Granite (Alkali-feldspar granite)
Hardness: 6-7 Mohs; Color: Pink, grey, and white with speckled green/black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) crystalline; Cleavage: None (minerals within have cleavage); Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, grey, and white with speckled green/black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, grey, and white with speckled green/black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) crystalline; Cleavage: None (minerals within have cleavage); Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. High silica content suggests continental crust origin, often dating back to the Precambrian or Paleozoic eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability.
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 by its interlocking mineral crystals (quartz, feldspar, and mica) large enough to see with the naked eye. Commonly found in mountain ranges and continental shields.
