Pink Granite

Physical Properties

Hardness: 6-7 on Mohs scale. Color: Mottled pink, grey, and white. Luster: Dull (sub-vitreous when polished). Crystal structure: Phaneritic (coarse-grained visible crystals). Cleavage: None (grains break irregularly). Specific gravity: 2.65 - 2.75.

Formation & Geological History

Formed through the slow cooling of silica-rich magma deep underground (plutonic). This specimen appears to be a river-worn or glacially-rounded pebble, likely millions to over a billion years old depending on the regional craton.

Uses & Applications

Used widely in construction as dimension stone, countertops, gravestones, and road base. Polished river stones of this variety are common in landscaping and home decor.

Geological Facts

The pink color is caused by the presence of Potassium Feldspar (Orthoclase). Granite makes up much of the Earth's continental crust and is unique to our planet in the solar system.

Field Identification & Locations

Identify by its 'salt and pepper' or mottled appearance with interlocking crystals of pink feldspar, translucent quartz, and dark biotite or hornblende. Commonly found in riverbeds, glacial tills, and mountainous outcrops.

Identified on: 4/24/2026

Mode: Standard