igneous
Pink Granite
Phaneritic Acidic Igneous Rock (primarily SiO2, Al2O3, K2O)
Hardness: 6-7 on Mohs scale; Color: Pink, reddish, grey, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect on feldspar grains; Specific gravity: 2.65 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, reddish, grey, and black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, reddish, grey, and black; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect on feldspar grains; Specific gravity: 2.65 to 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive). The pink color is due to an abundance of potassium feldspar (orthoclase). These can be hundreds of millions to billions of years old.
Uses & applications
Extensively used in construction (countertops, floor tiles, paving) and as dimension stone for monuments and gravestones due to its durability and aesthetics.
Geological facts
Mount Rushmore is carved into a granite batholith. Granite is one of the hardest and most common rocks in the Earth's continental crust.
Field identification & locations
Identify by its interlocking 'salt and pepper' or 'mosaic' appearance of pink feldspar, clear quartz, and dark mica. Commonly found in mountainous regions or glacial deposits.
