Granite Pebble

Physical Properties

Hardness: 6-7 Mohs; Color: Salt and pepper (white/grey quartz, pink/white feldspar, black biotite/hornblende); Luster: Vitreous to dull; Structure: Granular/Crystalline; Specific Gravity: 2.63 - 2.75

Formation & Geological History

Formed from the slow crystallization of magma below Earth's surface. This specific specimen has been water-worn into a rounded pebble, likely by river or glacial action.

Uses & Applications

Commonly used in heavy construction, countertops, monuments, and as aggregate. Pebbles are used for landscaping and garden decoration.

Geological Facts

Granite makes up a large portion of the Earth's continental crust. It is one of the hardest natural stones, which is why it stays preserved as smooth pebbles in riverbeds for thousands of years.

Field Identification & Locations

Identify by its interlocking 'salt and pepper' crystalline texture and extreme hardness (cannot be scratched by a steel knife). Commonly found in riverbeds, beaches, and glacial till.

Identified on: 4/13/2026

Mode: Standard