igneous
Granite
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale; Color: Mottled grey, white, pink, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Dependent on mineral constituents (perfect in mica, none in quartz); Specific Gravity: 2.63 - 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled grey, white, pink, and black
- Luster
- Dull to vitreous
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: Mottled grey, white, pink, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Dependent on mineral constituents (perfect in mica, none in quartz); Specific Gravity: 2.63 - 2.75
Formation & geological history
Formed from the slow crystallization of magma below the Earth's surface (intrusive). They are found in the continental crust and are typically millions to billions of years old.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as aggregate in road building.
Geological facts
Granite is the most common igneous rock found on Earth's continents. It originates from the Latin word 'granum', meaning a grain, in reference to its coarse-grained structure.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals. It is ubiquitous in mountain ranges and continental shields. For collectors, look for unique color variations or large crystal growth.
