igneous
Granite
Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)
Hardness: 6-7 Mohs; Color: Salt and pepper (pink, white, gray, and black); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarsegrained/visible crystals); Specific gravity: 2.63 - 2.75
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper (pink, white, gray, and black)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper (pink, white, gray, and black); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarsegrained/visible crystals); Specific gravity: 2.63 - 2.75
Formation & geological history
Formed from the slow subterranean cooling of silicic magma. Typically associated with intrusive batholiths in the continental crust, primarily from the Precambrian to Cenozoic eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments. Highly valued in industry for its durability and resistance to weathering.
Geological facts
Granite is the most common rock found in the Earth's continental crust and is unique to Earth among all planets in our solar system. The pedestal of the Statue of Liberty is made from granite.
Field identification & locations
Identify in the field by its interlocking, coarse crystals and lack of foliation. Commonly found in mountainous regions or where ancient glacial activity has exposed bedrock through erosion.
