Granite

Physical Properties

Hardness: 6-7 (Mohs). Color: Speckled gray, white, and pink. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained). Specific gravity: 2.63-2.75.

Formation & Geological History

Formed from the slow crystallization of silica-rich magma deep beneath the Earth's surface (intrusive). Found in continental crust, often part of ancient mountain belts.

Uses & Applications

Extensively used in construction for countertops, floor tiles, paving stones, monuments, and as aggregate in infrastructure.

Geological Facts

Granite is one of the hardest and most common rocks in the continental crust. The name comes from the Latin 'granum', meaning a grain, referring to its coarse-grained structure.

Field Identification & Locations

Identify by its interlocking 'salt and pepper' appearance of quartz, feldspar, and darker minerals (mica/amphibole). Common in mountain ranges and glacial deposits.

Identified on: 5/4/2026

Mode: Standard