igneous
Pink Granite
Phaneritic intrusive felsic igneous rock
Hardness: 6-7 (Mohs scale); Color: Pink to reddish-orange with white, gray, and black specks; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible crystals); Cleavage: Poor, fractures irregularly; Specific gravity: 2.63-2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- Pink to reddish-orange with white, gray, and black specks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Pink to reddish-orange with white, gray, and black specks; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible crystals); Cleavage: Poor, fractures irregularly; Specific gravity: 2.63-2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. High concentrations of potassium feldspar (orthoclase) give it the characteristic pink color. These formations can range from billions of years old (Precambrian) to more recent eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, and monuments. Also used in crushed form as road base and railway ballast. Polished specimens are popular in interior design.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Famous peaks like Yosemite's Half Dome are comprised of granite. The pink hue is specifically caused by the presence of orthoclase feldspar.
Field identification & locations
Identify in the field by its speckled, interlocking crystalline texture and pinkish-orange hue. It will scratch glass but cannot be scratched by a steel nail. Commonly found in batholiths and mountainous regions worldwide.
