igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
Hardness: 6-7 Mohs; Color: Grey, white, pinkish-tan; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained, visible crystals); Specific Gravity: 2.63 - 2.75
- Hardness
- 6-7 Mohs
- Color
- Grey, white, pinkish-tan
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Grey, white, pinkish-tan; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained, visible crystals); Specific Gravity: 2.63 - 2.75
Formation & geological history
Formed from the slow crystallization of magma below the Earth's surface (intrusive). Usually associated with mountain-building events and continental crust dating back hundreds of millions to billions of years.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stone, curbing, and monuments due to its durability and aesthetic appeal.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Mount Rushmore is carved into a granite batholith, and the rock is known for being extremely resistant to weathering.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocked crystals of different colors. Commonly found in quarries and mountainous regions worldwide.
