igneous
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
Hardness: 6-7 Mohs; Color: Pink, white, gray, with black flecks; Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained) crystalline; Density: 2.63 to 2.75 g/cm3.
- Hardness
- 6-7 Mohs
- Color
- Pink, white, gray, with black flecks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, white, gray, with black flecks; Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained) crystalline; Density: 2.63 to 2.75 g/cm3.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive). Most granite is associated with continental crust and mountain-building events over millions of years.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and as a decorative stone in monuments and memorials.
Geological facts
Granite is one of the hardest substances in the world; it is the most common igneous rock found on Earth's continents. The iconic peaks of Yosemite National Park are made of granite.
Field identification & locations
Identify in the field by its interlocking visible crystals of different colors. It is found in continental crust worldwide, especially in mountain ranges or Shield areas like the Canadian Shield.
