igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
Hardness: 6-7 on Mohs scale; Color: Pink, reddish-orange, gray, and black speckles; Luster: Vitreous to dull; Crystal Structure: Phaneritic (coarse-grained); Cleavage: Perfect in feldspar grains; Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, reddish-orange, gray, and black speckles
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, reddish-orange, gray, and black speckles; Luster: Vitreous to dull; Crystal Structure: Phaneritic (coarse-grained); Cleavage: Perfect in feldspar grains; Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed through the slow crystallization of silica-rich magma beneath the Earth's surface (intrusive). This specimen specifically contains high amounts of potassium feldspar (orthoclase) giving it the pink hue. Often found in continental crust and mountain ranges.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments. Also used as crushed stone for road aggregate.
Geological facts
Granite is the primary component of continental crust. The pink color is specifically due to the presence of potassium feldspar. It is one of the hardest and most durable common rocks on Earth.
Field identification & locations
Identify by its interlocking coarse crystals of pink feldspar, translucent gray quartz, and black biotite or hornblende. Commonly found in batholiths and mountain cores like the Rockies or the Scottish Highlands.
