igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
Hardness: 6-7 Mohs; Color: Pink, white, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in feldspars, none in quartz; Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, white, and grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, white, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in feldspars, none in quartz; Specific gravity: 2.63-2.75
Formation & geological history
Formed by the slow crystallization of magma below the Earth's surface (intrusive). The pink color comes from an abundance of potassium feldspar (orthoclase). These formations can range from millions to billions of years old.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments. High-quality specimens are popular for rock collections and educational purposes.
Geological facts
Pink granite is often the state rock of various regions, such as Missouri (Elephant Rocks). The specific pink hue is a result of the chemical composition of the magma, specifically high levels of potassium-rich minerals.
Field identification & locations
Identified by its visible interlocking crystals of pink feldspar and translucent quartz. Common in continental crust and mountain ranges like the Rockies or the Appalachians. Collectors should look for distinct large crystals.
