igneous
Granite (Pink/Red variety)
Felsic Intrusive Igneous Rock
Hardness: 6-7 (Mohs scale); Color: Pinkish-red with black and grey speckles; Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- Pinkish-red with black and grey speckles
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Pinkish-red with black and grey speckles; Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed through the slow cooling and crystallization of magma deep beneath the Earth's surface (plutonic). This sample appears water-worn or tumbled, suggesting it was found in a riverbed or beach environment.
Uses & applications
Used widely in construction for countertops, flooring, and monuments. Polished pebbles are used for landscaping, aquarium decor, and pocket stones.
Geological facts
The pink/red color is specifically caused by an abundance of potassium feldspar (orthoclase). Granite makes up the majority of the Earth's continental crust.
Field identification & locations
Identify by its 'salt and pepper' appearance and visible crystalline grains of quartz, feldspar, and mica. It is extremely common in mountainous regions and glacial till.
