igneous
Granite
Phaneritic plutonic rock (dominated by Quartz and Feldspar)
Hardness: 6-7 Mohs; Color: Pink, white, and grey; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained crystals); Cleavage: Distinct in feldspar grains; Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, white, and grey
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, white, and grey; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained crystals); Cleavage: Distinct in feldspar grains; Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. High silica content suggests continental crust origin, often dating from various eras throughout the Precambrian to the Cenozoic.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability.
Geological facts
Granite is one of the hardest and most common rocks on the planet, making up a significant portion of the Earth's continental crust. It is often pink due to high potassium feldspar content.
Field identification & locations
Identify in the field by looking for visible crystals of pink/white feldspar, glassy quartz, and dark specks of mica or hornblende. It is highly resistant to weathering.
