igneous
Granite
Plutonic Intrusive Igneous Rock (Granite)
AI-generated identification · may be incorrectPhaneritic (coarse-grained) texture composed mainly of quartz, alkali feldspar, and plagioclase. Hardness: 6-7 on the Mohs scale. Luster: Vitreous to dull. Color: Speckled gray, white, and black. Specific gravity: 2.63-2.75.
- Hardness
- 6-7 on the Mohs scale
- Color
- Speckled gray, white, and black
- Luster
- Vitreous to dull
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Physical properties
Phaneritic (coarse-grained) texture composed mainly of quartz, alkali feldspar, and plagioclase. Hardness: 6-7 on the Mohs scale. Luster: Vitreous to dull. Color: Speckled gray, white, and black. Specific gravity: 2.63-2.75.
Formation & geological history
Formed by the slow crystallization of silica-rich magma beneath the Earth's crust at high pressure and temperature over millions of years.
Uses & applications
Extensively used in construction, dimension stone, kitchen countertops, monuments, outdoor paving, and curbing due to its high durability and weather resistance.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Mount Rushmore and the Yosemite granite monoliths (like El Capitan) are famous examples of granite formations.
Field identification & locations
Identified in the field by its distinct interlocking salt-and-pepper crystalline matrix containing visible grains of quartz, feldspar, and dark biotite or amphibole. Found globally in continental crustal batholiths.
