igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
Hardness: 6-7 Mohs; Color: Salt-and-pepper (white, gray, black); Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained visible crystals); Cleavage: Distinct in feldspar grains; Specific gravity: 2.63-2.75.
- Hardness
- 6-7 Mohs
- Color
- Salt-and-pepper (white, gray, black)
- Luster
- Dull to vitreous
Identified More igneous →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 Mohs; Color: Salt-and-pepper (white, gray, black); Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained visible crystals); Cleavage: Distinct in feldspar grains; Specific gravity: 2.63-2.75.
Formation & geological history
Formed from the slow cooling and crystallization of felsic magma deep beneath the Earth's surface (plutonic). Found in continental crust, often appearing in mountain roots or batholiths formed millions of years ago.
Uses & applications
Extensively used in construction for countertops, flooring, monuments, and as crushed stone for road base and railway ballast due to its durability.
Geological facts
Granite makes up the majority of the Earth's continental crust. Mount Rushmore is carved into a massive outcropping of granite. It is one of the hardest and most durable common stones on Earth.
Field identification & locations
Identify by its 'salt and pepper' look with interlocking visible crystals of white/gray quartz and pink or white feldspar. Found globally in mountainous regions and areas of exposed bedrock.
