Granite Tile (Commercial Granite)

Physical Properties

Hardness: 6-7 (Mohs); Color: Mottled grey, white, black, and brown; Luster: Vitreous/Polished; Crystal Structure: Phaneritic (coarse-grained); Cleavage: No true cleavage (conchoidal fracture); Specific Gravity: 2.6-2.7

Formation & Geological History

Formed through the slow crystallization of magma below the Earth's surface. Often hundreds of millions to billions of years old, found in continental crust.

Uses & Applications

Primarily used in construction for flooring, countertops, monument stones, and exterior cladding due to its durability and resistance to weathering.

Geological Facts

Geologically reaching heights like Mount Rushmore and Yosemite's El Capitan, granite is the most common rock found in the Earth's continental crust.

Field Identification & Locations

Identify in the field by its 'salt and pepper' appearance and interlocking visible crystals of quartz, feldspar, and mica. Found globally in mountainous regions and shield areas.

Identified on: 4/16/2026

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