Granite Pebble

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Mottled white, grey, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible crystals); Cleavage: None (fractures); Specific gravity: 2.63–2.75

Formation & Geological History

Formed from the slow cooling of silica-rich magma deep underground (plutonic). This specimen appears to be water-worn into a pebble shape over thousands of years.

Uses & Applications

Used in construction, countertops, monuments, and as decorative landscaping stones.

Geological Facts

Granite makes up a large portion of the Earth's continental crust. Its name comes from the Latin 'granum', meaning a grain, in reference to its coarse-grained structure.

Field Identification & Locations

Identify by its 'salt and pepper' appearance and visible interlocking crystals of quartz and feldspar. Commonly found in riverbeds, glacial tills, and mountainous regions.

Identified on: 5/3/2026

Mode: Standard