igneous
Granite
Granite (Phaneritic Acidic Igneous Rock)
Hardness: 6-7 Mohs; Color: Gray, tan, white with visible crystalline specks; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained); Cleavage: None (grains break unevenly); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Gray, tan, white with visible crystalline specks
- 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; Color: Gray, tan, white with visible crystalline specks; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained); Cleavage: None (grains break unevenly); Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of silica-rich magma below the Earth's surface. This specimen appears weathered, likely found in a surface deposit or riverbed. Most granite formations range from Precambrian to Cenozoic eras.
Uses & applications
Extensively used in construction (countertops, flooring), monuments, paving stones, and as crushed stone for road base.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and most durable common rocks, which is why it has been used in ancient Egyptian pyramids and modern skyscrapers.
Field identification & locations
Identify by its 'salt and pepper' appearance and visible crystals of quartz, feldspar, and mica. This weathered sample shows tan/gray coloration typical of surface exposure. Found globally in mountainous regions and continental shields.
