igneous
Pink Granite
Phaneritic intrusive igneous rock (Felsic)
Hardness: 6-7 on Mohs scale; Color: Pink, white, and black mottled; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Distinct in feldspar grains; Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, white, and black mottled
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, white, and black mottled; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: Distinct in feldspar grains; Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed by the slow cooling of silica-rich magma deep underground. The pink color is specifically due to a high concentration of potassium feldspar (orthoclase). These formations can range from hundreds of millions to billions of years old.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments. Also popular as crushed stone and for decorative landscaping.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Mount Rushmore is carved into a granite batholith. The pink hues vary depending on the specific mineral chemistry of the magma during crystallization.
Field identification & locations
Identified by its visible 'salt and pepper' crystalline texture and pinkish hue. Commonly found in mountainous regions or where ancient continental shields are exposed. Collectors look for unique mineral inclusions or large phenocrysts.
