igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
Hardness: 6-7 Mohs; Color: Salt and pepper (white, gray, black); Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper (white, gray, black)
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper (white, gray, black); Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63-2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. It is a coarse-grained intrusive rock often found in continental crust and mountain ranges from various geological eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability.
Geological facts
Granite is one of the hardest substances in the world. Mount Rushmore is carved into a massive granite batholith in South Dakota.
Field identification & locations
Identify by its visible interlocking crystals of quartz (clear/gray) and feldspar (white/pink). Found worldwide in mountain belts and shield areas. Excellent for beginner collectors because of its ubiquity.
