igneous
Pink Granite
Granite (Phaneritic Felsic Igneous Rock)
Hardness: 6-7 Mohs; Color: Pink, reddish-orange, gray, and white; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: None (distinct mineral cleavage for feldspar components); Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, reddish-orange, gray, and white
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, reddish-orange, gray, and white; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: None (distinct mineral cleavage for feldspar components); Specific gravity: 2.63 to 2.75
Formation & geological history
Formed through the slow crystallization of silica-rich magma beneath the Earth's surface (intrusive). The pink color is due to the presence of potassium feldspar (orthoclase). These formations can range from billions of years old (Precambrian) to much younger, found in continental crust environments.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and curbing. It is also used for monuments, gravestones, and as decorative aggregate in landscaping.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The 'pink' variety is specifically high in K-feldspar. Mount Rushmore is carved into a granite batholith, and it is one of the hardest natural stones used in architecture.
Field identification & locations
Identify in the field by its interlocking coarse grains of salmon-pink feldspar, glassy gray quartz, and dark specks of mica or amphibole. It is found in mountain ranges and ancient shield areas like the Canadian Shield or the Llano Uplift in Texas.
