igneous
Pink Granite
Phaneritic Felsic Igneous Rock
Hardness: 6-7 on Mohs scale; Color: Pink, reddish-orange with grey and black specks; Luster: Dull to vitreous; Crystal Structure: Coarse-grained phaneritic; Cleavage: Poor; Specific Gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, reddish-orange with grey and black specks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, reddish-orange with grey and black specks; Luster: Dull to vitreous; Crystal Structure: Coarse-grained phaneritic; Cleavage: Poor; Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. The pink color is primarily due to a high concentration of potassium feldspar (orthoclase). These can date back billions of years to the Precambrian era.
Uses & applications
Used extensively in construction (countertops, tiles), monuments, curbing, and as decorative gravel. Polished specimens are used in jewelry and ornaments.
Geological facts
Granite is the primary component of the Earth's continental crust. Mount Rushmore is carved into a granite batholith. Its durability makes it one of the most popular stones in human history.
Field identification & locations
Identify by its salt-and-pepper appearance with distinct interlocking crystals. It is found in mountain ranges and glaciated regions worldwide. Look for the characteristic pink feldspar combined with translucent quartz and dark biotite or hornblende.
