igneous
Granite
Felsic intrusive igneous rock
Hardness: 6-7 Mohs; Color: Pink, white, gray, and black mottled patterns; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75.
- Hardness
- 6-7 Mohs
- Color
- Pink, white, gray, and black mottled patterns
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, white, gray, and black mottled patterns; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. It is a major component of the continental crust and can range in age from millions to billions of years old.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stone, monuments, and as crushed stone for road base.
Geological facts
Granite is one of the hardest and most durable substances on Earth, making it a favorite for lasting monuments. It contains quartz, feldspar, and mica, which give it its characteristic sparkle.
Field identification & locations
Identify in the field by its interlocking coarse grains and speckled multi-color appearance. It is commonly found in mountain ranges and eroded shield areas like the Appalachians or the Canadian Shield.
