igneous
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
Hardness: 6-7 Mohs; Color: Salt and pepper (gray, white, black); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper (gray, white, black)
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper (gray, white, black); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. It is an intrusive igneous rock typical of continental crust, often dating back hundreds of millions of years.
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 hardest substances in the world. Mount Rushmore is carved into a granite batholith in South Dakota.
Field identification & locations
Identify by its visible interlocking crystals of quartz (clear/gray) and feldspar (white/pink). Found worldwide in mountain ranges and Shields. Collectors look for unique mineral inclusions.
