igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
Hardness: 6-7 (Mohs); Color: Phaneritic (visible grains) of white, pink, grey, and black; Luster: Vitreous to pearly; Crystal structure: Massive/Phaneritic; Cleavage: None for the rock as a whole, though constituent minerals have specific planes.
- Hardness
- 6-7 (Mohs)
- Color
- Phaneritic (visible grains) of white, pink, grey, and black
- Luster
- Vitreous to pearly
Identified More igneous →
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Physical properties
Hardness: 6-7 (Mohs); Color: Phaneritic (visible grains) of white, pink, grey, and black; Luster: Vitreous to pearly; Crystal structure: Massive/Phaneritic; Cleavage: None for the rock as a whole, though constituent minerals have specific planes.
Formation & geological history
Intrusive igneous rock formed by the slow crystallization of magma below the Earth's surface during various geological periods.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, monuments, and curbing due to its durability.
Geological facts
Granite is the primary rock of the Earth's continental crust. It is one of the hardest natural substances and is famously used in the sculptures of Mount Rushmore.
Field identification & locations
Identified by its salt-and-pepper appearance and coarse grain. Commonly found in mountainous regions or stable shield areas where erosion has exposed the deep crust.
