igneous
Granite
Phaneritic Felsic Igneous Rock
Hardness: 6-7 (Mohs scale); Color: White to light gray with speckled black/gray minerals; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Composition: Quartz, Alkali Feldspar, and Plagioclase.
- Hardness
- 6-7 (Mohs scale)
- Color
- White to light gray with speckled black/gray minerals
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: White to light gray with speckled black/gray minerals; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Composition: Quartz, Alkali Feldspar, and Plagioclase.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. It is a coarse-grained intrusive rock that can form in various geological ages, often found in continental crust and mountain ranges.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments. It is also used as crushed stone in road base and concrete.
Geological facts
Granite is the most common igneous rock found on Earth's continents. The iconic peaks of Yosemite National Park, like Half Dome, are composed of massive granite batholiths.
Field identification & locations
Identify in the field by its speckled 'salt and pepper' appearance and visible interlocking crystals. It is harder than steel and will not be easily scratched by a knife. Found globally in continental shield areas.
