igneous
Granite
Granite (Felsic Plutonic Rock)
Hardness: 6-7 on Mohs scale. Color: Phaneritic (coarsegrained) mix of white, gray, pink, and black. Luster: Vitreous to dull. Structure: Granular, non-foliated. Composition: Primarily Quartz (SiO2), Feldspar, and Mica.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
Identified More igneous →
Explore Granite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 on Mohs scale. Color: Phaneritic (coarsegrained) mix of white, gray, pink, and black. Luster: Vitreous to dull. Structure: Granular, non-foliated. Composition: Primarily Quartz (SiO2), Feldspar, and Mica.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive). Most granite dates from the Precambrian or Paleozoic eras, forming in continental crustal environments.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments. Also used as crushed stone for road base and aggregate.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Mount Rushmore and Yosemite's El Capitan are famous geological formations composed entirely of granite.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals. Common in mountain ranges and ancient shield areas. Collectors look for large crystals or unique color variations.
