igneous
Granite
Granitoid
Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper (white, gray, black, pink). Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained). Specific gravity: 2.63 - 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Salt-and-pepper (white, gray, black, pink)
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper (white, gray, black, pink). Luster: Dull to vitreous. Crystal 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). They can date back billions of years and are found in the continental crust.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments because of its durability.
Geological facts
Granite is the most common igneous rock found at Earth's surface. It makes up much of the continental crust. Many of the world's highest mountain peaks are capped with granite.
Field identification & locations
Identify in the field by its interlocking coarse grains of quartz and feldspar; it does not have layers (non-foliated) and is resistant to scratching. Found globally in mountainous regions.
