igneous
Granite
Phaneritic Felsic Igneous Rock
Hardness: 6-7 on Mohs scale. Color: Mottled white, pink, and grey with black specks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled white, pink, and grey with black specks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled white, pink, and grey with black specks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed from the slow crystallization of silica-rich magma beneath the Earth's surface (intrusive). Typical of continental crust formation, occurring across diverse geological eras from the Precambrian to the Cenozoic.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability and aesthetic appeal.
Geological facts
Granite is the most common igneous rock found on Earth's surface and makes up a large portion of the continental crust. The black specks are usually biotite mica or hornblende.
Field identification & locations
Identify by its interlocking 'salt and pepper' crystalline texture where minerals are large enough to see with the naked eye. Commonly found in mountain ranges and shield areas. It will not be scratched by steel.
