igneous
Granite
Intrusive Felsic Igneous Rock
Hardness: 6-7 on Mohs scale; Color: Gray, tan, and pinkish hues; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible crystals of quartz, feldspar, and mica); Specific gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, tan, and pinkish hues
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray, tan, and pinkish hues; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible crystals of quartz, feldspar, and mica); Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. Can be hundreds of millions to billions of years old, typically found in continental crust and mountain ranges.
Uses & applications
Widely used in construction, countertops, monuments, and as crushed stone for road base and aggregate.
Geological facts
Granite makes up a large part of the Earth's continental crust. El Capitan in Yosemite National Park is one of the most famous massive granite monoliths in the world.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals. Common in mountainous regions or areas where ancient bedrock is exposed.
