igneous
Granite
Granite (Phaneritic Igneous Rock)
Hardness: 6-7 on Mohs scale; Color: Gray, pinkish, or white with dark speckles; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, pinkish, or white with dark speckles
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray, pinkish, or white with dark speckles; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. It is a plutonic rock that forms deep within the crust over millions of years.
Uses & applications
Commonly used as a dimension stone in construction for countertops, floor tiles, paving stones, and monuments due to its durability.
Geological facts
Granite makes up a large part of the Earth's continental crust. Mount Rushmore is carved from a granite batholith in South Dakota.
Field identification & locations
Identified by its visible, interlocking crystals of quartz, feldspar, and mica. Commonly found in mountainous regions or glacial till. Collectors look for unique color variations and larger mineral inclusions.
