igneous
Granite
Phaneritic Felsic Igneous Rock (Granite)
Hardness: 6-7 on Mohs scale; Color: Grayish-white with dark flecks; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Grayish-white with dark flecks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Grayish-white with dark flecks; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific gravity: 2.63-2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). They can be hundreds of millions of years old, primarily found in continental crust and mountain belts.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, curbing, monuments, and as a dimension stone.
Geological facts
Granite is one of the hardest and most durable natural stones. Mount Rushmore is carved into a massive granite batholith in South Dakota.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals of quartz, feldspar, and mica. Found in many mountainous terrains globally.
