Granite

Physical Properties

Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper (white, gray, black, pink). Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained). Specific gravity: 2.63 - 2.75.

Formation & Geological History

Formed from the slow crystallization of magma below the Earth's surface (intrusive). They can date back billions of years and are found in the continental crust.

Uses & Applications

Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments because of its durability.

Geological Facts

Granite is the most common igneous rock found at Earth's surface. It makes up much of the continental crust. Many of the world's highest mountain peaks are capped with granite.

Field Identification & Locations

Identify in the field by its interlocking coarse grains of quartz and feldspar; it does not have layers (non-foliated) and is resistant to scratching. Found globally in mountainous regions.

Identified on: 4/26/2026

Mode: Standard