igneous
Pink Granite
Phaneritic plutonic igneous rock (Alkali feldspar granite)
Hardness: 6-7 Mohs; Color: Pink to reddish-orange from potassium feldspar, with grey quartz and black biotite/hornblende; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink to reddish-orange from potassium feldspar, with grey quartz and black biotite/hornblende; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
Formation & geological history
Formed by the slow cooling of silica-rich magma deep underground. This specimen likely contains high concentrations of orthoclase feldspar. Geological age can range from Precambrian to Cenozoic depending on the location of extraction.
Uses & applications
Extensively used in construction, countertops, monuments, and as crushed stone for road bases. Polished specimens are popular architectural decorative stones.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The pink color is specifically due to the presence of Potassium-rich feldspar (Orthoclase).
Field identification & locations
Identified by its interlocked coarse grains of pink/orange feldspar, glassy grey quartz, and dark mafic minerals. Found globally in batholiths and mountain ranges. Common in the Canadian Shield, Scotland, and the Appalachian Mountains.
