igneous
Granite
Phaneritic Felsic Igneous Rock
Hardness: 6-7 on Mohs scale. Color: Gray, tan, and white mottled appearance. Luster: Dull to vitreous. Crystal structure: Phaneritic (visible interlocking crystals of quartz, feldspar, and mica). Specific gravity: 2.63-2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, tan, and white mottled appearance
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Gray, tan, and white mottled appearance. Luster: Dull to vitreous. Crystal structure: Phaneritic (visible interlocking 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 (intrusive). They are typically found in continental crustal plates and date back millions to billions of years through various orogenic events.
Uses & applications
Widely used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability and resistance to weathering.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Mount Rushmore is carved into a massive granite batholith in the Black Hills of South Dakota.
Field identification & locations
Identify by its 'salt and pepper' look and the presence of visible, interlocking mineral grains. Commonly found in mountainous regions or riverbeds as rounded cobbles like the specimen pictured.
