igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)
Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper look with pink/tan, white, and black tones. Luster: Vitreous to pearly. Crystal structure: Phaneritic (coarse-grained) crystalline. SG: 2.63 - 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Salt-and-pepper look with pink/tan, white, and black tones
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper look with pink/tan, white, and black tones. Luster: Vitreous to pearly. Crystal structure: Phaneritic (coarse-grained) crystalline. SG: 2.63 - 2.75.
Formation & geological history
Formed through the slow crystallization of magma below the Earth's surface (intrusive). Can be found in continental crust environments dating back billions of years to the Precambrian era.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monument stone due to its durability.
Geological facts
Granite is the most common intrusive igneous rock in Earth's continental crust. Mount Rushmore is carved into a granite batholith in South Dakota.
Field identification & locations
Identify in the field by its coarse crystalline texture where individual mineral grains (clear quartz, white/pink feldspar, black mica) are visible to the naked eye. Found globally in mountain ranges and shield areas.
