igneous
Granite
Felsic intrusive igneous rock
Hardness: 6 on the Mohs scale. Color: Light-colored (pink, white, gray, or black speckled). Luster: Dull to sub-vitreous. Crystal structure: Phaneritic (coarse-grained, visible interlocking crystals). Cleavage: None distinct as a rock, but individual constituent minerals have cleavage. Specific gravity: 2.65 to 2.75.
- Hardness
- 6 on the Mohs scale
- Color
- Light-colored (pink, white, gray, or black speckled)
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 6 on the Mohs scale. Color: Light-colored (pink, white, gray, or black speckled). Luster: Dull to sub-vitreous. Crystal structure: Phaneritic (coarse-grained, visible interlocking crystals). Cleavage: None distinct as a rock, but individual constituent minerals have cleavage. Specific gravity: 2.65 to 2.75.
Formation & geological history
Formed from the slow cooling and solidification of magma rich in silica and alkali feldspar beneath the Earth's surface. Can range from Precambrian to Cenozoic in geological age.
Uses & applications
Widely used in construction, architectural facades, monument building, countertops, and decorative flooring.
Geological facts
Granite is the most common rock of the Earth's continental crust and is rarely found on any other planet. Its interlocking mineral grains make it extremely durable and resistant to weathering.
Field identification & locations
Easily identified by its speckled, coarse-grained appearance containing visible quartz, feldspar, and mica crystals. Found worldwide in continental shields and mountain roots.
