igneous
Pink Granite
Phaneritic Plutonic Felsic Rock (Granite)
Hardness: 6-7 Mohs; Color: Pink, orange, red with grey/white and black specks; Luster: Vitreous to dull; Crystal structure: Phaneritic (large, visible grains); Cleavage: Perfect on feldspar grains; Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, orange, red with grey/white and black specks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, orange, red with grey/white and black specks; Luster: Vitreous to dull; Crystal structure: Phaneritic (large, visible grains); Cleavage: Perfect on feldspar grains; Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow cooling and crystallization of magma deep underground (intrusive). Predominantly composed of orthoclase feldspar, quartz, and mica/amphibole. Found in continental crust across all geological ages, often in batholiths.
Uses & applications
Extensively used in construction for countertops, flooring, monuments, and curbing. Used as crushed stone for road base and aggregate. Highly valued as an ornamental stone in architecture.
Geological facts
The pink color is specifically due to a high concentration of potassium-rich orthoclase feldspar. Mount Rushmore is carved into a granite batholith. It is one of the oldest and most abundant rocks on Earth's continental crust.
Field identification & locations
Identify by its interlocking 'salt and pepper' crystalline texture and pinkish orthoclase content. Found in mountainous or shield regions like the Scottish Highlands, the Rockies, or the Canadian Shield. Unlike sandstone, it won't crumble between fingers.
