Igneous
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Hardness: 6-7 (Mohs scale); Color: Mottled grey, white, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Indistinct; Specific gravity: 2.6 – 2.7 g/cm³.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled grey, white, 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 (Mohs scale); Color: Mottled grey, white, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Indistinct; Specific gravity: 2.6 – 2.7 g/cm³.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (plutonic). It is found in continental crust across all geological ages, particularly in the roots of mountain ranges.
Uses & applications
Widely used in construction for countertops, floor tiles, paving stones, and monuments due to its durability and resistance to weathering.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Famous landmarks like Mount Rushmore and the base of the Statue of Liberty are made primarily of granite.
Field identification & locations
Identified in the field by its 'salt and pepper' appearance caused by interlocking crystals of quartz, feldspar, and mica. It is commonly found in batholiths and mountain cores; collectors should look for visible, interlocked mineral grains rather than layers.
