igneous
Pink Granite
Granite (Phaneritic igneous rock)
Hardness: 6-7 on Mohs scale; Color: Pink, white, gray, and black mottled; Luster: Vitreous to dull; Crystal structure: Course-grained, phaneritic; Specific gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, white, gray, and black mottled
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, white, gray, and black mottled; Luster: Vitreous to dull; Crystal structure: Course-grained, phaneritic; Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive). Composed primarily of potassium feldspar (providing the pink hue), quartz, and mica. Geological ages vary from Precambrian to Cenozoic.
Uses & applications
Widely used in construction for countertops, floor tiles, paving stones, curbing, and monuments. Also popular as crushed stone for road base.
Geological facts
Granite makes up much of the Earth's continental crust. Its pink color is specifically due to the abundance of orthoclase feldspar. Famous monuments like Mount Rushmore are carved into granite batholiths.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance with visible pink grains and a very hard surface that cannot be scratched by a steel knife. Found in mountainous regions and continental shields.
