Pink Granite

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Pink, reddish-pink, white, and black speckled; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained) containing potassium feldspar, quartz, and mica; Cleavage: None (though individual feldspar grains have cleavage).

Formation & Geological History

Formed through the slow crystallization of magma below the Earth's surface (intrusive). The high concentration of potassium feldspar (orthoclase) gives it the distinctive pink color. These rocks can be hundreds of millions to billions of years old.

Uses & Applications

Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments. It is also used as crushed stone for road base and railroad ballast.

Geological Facts

Granite makes up a large portion of the Earth's continental crust. El Capitan in Yosemite National Park is one of the most famous granite monoliths in the world. Its pink hue is specifically caused by the presence of Orthoclase feldspar.

Field Identification & Locations

Identify in the field by its coarse crystalline texture where individual mineral grains (pink feldspar, clear quartz, black biotite) are visible to the naked eye. It is very hard and will scratch glass. Commonly found in mountainous regions or shield areas like the Canadian Shield or the Appalachians.

Identified on: 4/26/2026

Mode: Standard