igneous
Granite
Granite (Felsic Plutonic Rock)
Hardness: 6-7 Mohs; Color: Salt and pepper (white, gray, black, pink); Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Cleavage: None (fractures); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper (white, gray, black, pink)
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper (white, gray, black, pink); Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Cleavage: None (fractures); Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of silica-rich magma beneath the Earth's surface (intrusive). Geological age can range from Precambrian to Cenozoic.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as a structural stone due to its durability.
Geological facts
Granite makes up a large part of the continental crust. The stone shown appears to be a stream-rounded or weathered cobble, smoothing out the typically sharp crystal facets.
Field identification & locations
Identify in the field by its coarse-grained 'salt and pepper' appearance and hardness (it will scratch glass). Commonly found in mountain ranges and glacial till.
