igneous
Pink Granite (Alkali Feldspar Granite)
Phaneritic Felsic Igneous Rock (composed primarily of KAlSi3O8, SiO2, and NaAlSi3O8)
Hardness: 6-7 Mohs scale; Color: Pink, reddish-orange with speckled white/grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in two directions for feldspar components; Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 Mohs scale
- Color
- Pink, reddish-orange with speckled white/grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs scale; Color: Pink, reddish-orange with speckled white/grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in two directions for feldspar components; Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). Geological age varies globally but frequently associated with Precambrian or Paleozoic tectonic events. The pink color comes from a high concentration of potassium feldspar (orthoclase).
Uses & applications
Used extensively in construction for countertops, floor tiles, and paving stones. Also used in monuments, curbing, and as crushed aggregate for road foundations.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Famous specimens include the monoliths of Yosemite National Park (like El Capitan) and the pink granite of the Aswan quarries used by Ancient Egyptians for obelisks.
Field identification & locations
Identify in the field by its 'salt and pepper' or speckled texture with visible interlocking crystals. It will not react with acid (unlike limestone) and is hard enough to scratch glass. Found globally in mountainous regions and continental shields like the Canadian Shield.
