igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
Hardness: 6-7 on Mohs scale; Color: Pink, white, and gray with black specks; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained visible crystals); Cleavage: Distinct in feldspar grains; Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, white, and gray with black specks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, white, and gray with black specks; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained visible crystals); Cleavage: Distinct in feldspar grains; Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow cooling and crystallization of silica-rich magma deep within the Earth's crust (intrusive). The pink color is specifically due to a high concentration of potassium feldspar (orthoclase). Found in continental crust units worldwide, often dating from the Precambrian to Cenozoic eras.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, and monuments. Also used as crushed stone for road base and aggregate in concrete.
Geological facts
Granite makes up a large part of the continental crust. The pink color occurs when potassium feldspar is dominant over other minerals. Mount Rushmore is carved into a massive granite batholith.
Field identification & locations
Identify in the field by its 'salt and pepper' look with pink hues, visible interlocking crystals of quartz, feldspar, and mica, and its inability to be scratched by a steel knife. It is found in mountain ranges and areas where erosion has exposed ancient plutonic cores.
