Granite

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Mottled pink, white, gray, and black; Luster: Phaneritic (granular/crystalline); Structure: Massive/Granular; Specific Gravity: 2.63 - 2.75

Formation & Geological History

Formed by the slow crystallization of magma below the Earth's surface. It is a plutonic rock that cools over millions of years, typically found in continental crust and mountain belts.

Uses & Applications

Extensively used in construction for countertops, floor tiles, paving stone, monuments, and bridges due to its durability and resistance to weathering.

Geological Facts

Granite is the most common rock in the Earth's continental crust. Mount Rushmore in South Dakota is carved into a massive outcrop of granite.

Field Identification & Locations

Identify in the field by its interlocking crystals of quartz (clear), feldspar (pink or white), and mica (shiny black flakes). It is found globally in large continental masses.

Identified on: 5/17/2026

Mode: Standard