igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
Hardness: 6-7 on Mohs scale; Color: Pink, white, and grey with black flecks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained crystals); Composition: Orthoclase feldspar (pink), quartz (clear/white), plagioclase, and biotite/hornblende (black); Specific Gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, white, and grey with black flecks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, white, and grey with black flecks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained crystals); Composition: Orthoclase feldspar (pink), quartz (clear/white), plagioclase, and biotite/hornblende (black); Specific Gravity: 2.63 to 2.75.
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface (intrusive). The pink color is derived from an abundance of potassium feldspar (orthoclase). These formations can range from hundreds of millions to billions of years old.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, curbing, and monuments. High-quality specimens are popular for rock collecting and landscaping.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The pink hue is specifically caused by the mineral orthoclase, a type of potassium feldspar. It is one of the hardest and most durable natural stones available.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance with visible interlocking crystals and a lack of layering. It is commonly found in mountain ranges and glacial till. Collectors should look for large, distinct crystal grains.
