igneous
Gray Granite
Phaneritic plutonic rock (Granite)
Hardness: 6-7 on Mohs scale; Color: Gray with salt-and-pepper appearance; Luster: Dull to vitreous; Structure: Coarse-grained (phaneritic); Composition: Quartz, Feldspar, and Mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Gray with salt-and-pepper appearance
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray with salt-and-pepper appearance; Luster: Dull to vitreous; Structure: Coarse-grained (phaneritic); Composition: Quartz, Feldspar, and Mica.
Formation & geological history
Formed by the slow crystallization of magma below the Earth's surface (intrusive). Most granites date from the Precambrian to the Cenozoic eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It was used in the construction of the Egyptian pyramids and is the material of Mount Rushmore.
Field identification & locations
Identify by its speckled appearance and visible interlocking crystals. Common worldwide in mountain ranges and shields. Collectors look for unique inclusions or high mica content.
