igneous
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
Hardness: 6-7 on Mohs scale; Color: Pink, gray, white, and black speckled appearance; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, gray, white, and black speckled appearance
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, gray, white, and black speckled appearance; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow subterranean cooling and crystallization of magma. Common in continental crust and mountain ranges, often dating back hundreds of millions to billions of years.
Uses & applications
Widely used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as a dimension stone for buildings.
Geological facts
Granite is the most common igneous rock found on Earth's surface. It makes up much of the continental crust and is famously seen in formations like Yosemite's Half Dome.
Field identification & locations
Identify by its interlocking 'salt and pepper' crystalline texture where minerals are large enough to see with the naked eye. Look for quartz (clear/gray), feldspar (pink/white), and biotite or hornblende (black).
