igneous
Granite
Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
Hardness: 6 to 7 (Mohs); Color: Pink, gray, white with black specks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75
- Hardness
- 6 to 7 (Mohs)
- Color
- Pink, gray, white with black specks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6 to 7 (Mohs); Color: Pink, gray, white with black specks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow crystallization of magma below the Earth's surface (intrusive). Geological ages can range from billions of years (Precambrian) to the Cenozoic era.
Uses & applications
Used widely in construction for countertops, floor tiles, paving stone, monuments, and as crushed stone for road base.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is extremely durable and resistant to weathering compared to other rock types.
Field identification & locations
Identify by its interlocking crystalline texture where individual mineral grains (pink feldspar, clear quartz, dark mica/amphibole) are visible to the naked eye. Found globally in mountainous regions and continental shields.
