igneous
Granite
Phaneritic Felsic Igneous Rock
Hardness: 6-7 Mohs; Color: Salt and pepper (white, gray, black); Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper (white, gray, black)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper (white, gray, black); Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below the Earth's surface (intrusive). Composed mainly of quartz, feldspar, and mica. Formation can span billions of years in continental crust.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stone, curbing, and monuments due to its durability.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and most resistant rocks, often forming the cores of mountain ranges after erosion removes overlying layers.
Field identification & locations
Identify by its interlocking visible crystals of different colors. It is found globally in batholiths and mountain ranges. This specific specimen shows signs of being water-worn or tumbled.
