igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
Hardness: 6-7 Mohs; Color: Pink, orange, white, and gray; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, orange, white, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, orange, white, and gray; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. It is a plutonic rock that makes up much of the continental crust.
Uses & applications
Used extensively in construction (curbstones, floor tiles), kitchen countertops, monuments, and as crushed stone for road base.
Geological facts
Granite is the most common igneous rock found at Earth's surface. Mount Rushmore is carved into a granite batholith in South Dakota.
Field identification & locations
Identify by its 'salt and pepper' appearance and distinct large crystals of quartz and pinkish feldspar. Found globally in mountainous regions and shield areas.
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