igneous
Granite
Phaneritic plutonic igneous rock (felsic)
Hardness: 6-7 Mohs; Color: Pink, white, and black speckled; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, white, and black speckled
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, white, and black speckled; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63-2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. It is composed primarily of quartz, feldspar, and mica. This specimen appears water-worn or tumbled into a rounded cobble shape.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stone, curbing, and monuments due to its durability and aesthetic appeal.
Geological facts
Granite makes up the majority of the Earth's continental crust. Mount Rushmore is carved into a granite batholith in the Black Hills of South Dakota.
Field identification & locations
Identified by its visible interlocking crystals of different colors. It is commonly found in mountain ranges and continental shields globally. Water-worn pieces like this are often found in riverbeds.
