Granite

Physical Properties

Hardness: 6-7 Mohs; Color: Salt and pepper (white/grey with black spots); Luster: Sub-vitreous to dull; Structure: Granular/Crystalline; Cleavage: None (fractures); Specific Gravity: 2.63-2.75

Formation & Geological History

Formed through the slow crystallization of magma below Earth's surface. This specimen appears to be a water-worn or tumbled pebble, likely from a riverbed or coastal environment.

Uses & Applications

Used extensively in construction (countertops, flooring, monuments), as crushed stone for road base, and as decorative landscaping stones.

Geological Facts

Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and most durable common stones, which is why it has been used for monuments throughout human history.

Field Identification & Locations

Identify by its 'salt and pepper' appearance of quartz (grey/clear), feldspar (white), and mafic minerals (black). Commonly found in mountainous regions or glacial deposits.

Identified on: 5/3/2026

Mode: Standard