Pink Granite

Physical Properties

Hardness: 6-7 Mohs; Color: Pinkish-red, white, and black specs; Luster: Dull to vitreous; Structure: Phaneritic (visible crystals); Cleavage: Distinct in feldspar grains; SG: 2.63-2.75

Formation & Geological History

Formed by the slow cooling of silica-rich magma deep underground (intrusive). The pink color comes from an abundance of potassium feldspar (orthoclase). Found in ancient continental crust across various geological ages.

Uses & Applications

Major construction material, countertops, monuments, floor tiles, and road aggregate.

Geological Facts

Granite is the most common igneous rock found in Earth's continental crust. Most of the 'granite' used in monuments like Mount Rushmore is technically this type of phaneritic rock.

Field Identification & Locations

Identify by looking for interlocked visible crystals of pink feldspar, translucent quartz, and dark biotite or hornblende. Commonly found in mountainous regions or as glacial erratics and decorative gravel.

Identified on: 4/24/2026

Mode: Standard