igneous
Pink Granite
Granite (Felsic intrusive igneous rock)
Hardness: 6-7 Mohs; Color: Pink, orange-red, gray, and black speckles; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained) crystalline; Cleavage: Indistinct; Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, orange-red, gray, and black speckles
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, orange-red, gray, and black speckles; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained) crystalline; Cleavage: Indistinct; Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow subterranean cooling of silica-rich magma (plutonic). Its pink color is due to a high concentration of potassium feldspar (orthoclase). Found in continental crust formations globally, often dating back hundreds of millions of years.
Uses & applications
Widely used for kitchen countertops, floor tiles, paving stones, monuments, and construction aggregate. Also popular as a lapidary material for decorative carvings.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Enchanted Rock in Texas and the peaks of Yosemite are iconic examples of massive granite batholiths exposed at the surface.
Field identification & locations
Identify by its visible interlocking crystals of pink feldspar, translucent quartz, and dark mica or hornblende. Commonly found in mountainous regions or glacial till. Collectors look for large, well-defined mineral grains.
