igneous
Gray Granite
Granite (Phaneritic igneous rock)
Hardness: 6-7 on Mohs scale; Color: Gray, salt-and-pepper appearance; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, salt-and-pepper appearance
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray, salt-and-pepper appearance; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct; Specific gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow crystallization of silica-rich magma below the Earth's surface (intrusive). They can be hundreds of millions to billions of years old, often found in the cores of mountain ranges.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability and resistance to weathering.
Geological facts
Granite is one of the most common rocks on Earth's continental crust. It is often the primary material of famous mountain peaks like El Capitan in Yosemite National Park.
Field identification & locations
Identify by the presence of visible interlocking crystals of quartz (clear/gray), feldspar (white/pink), and mica (black). Commonly found in continental mountain ranges and eroded shield areas.
