Granite Pebble

Physical Properties

Hardness: 6-7 (Mohs scale), Color: Salt and pepper (white/grey/black), Luster: Dull to vitreous, Crystal structure: Phaneritic (visible interlocking crystals), Specific gravity: 2.63 - 2.75

Formation & Geological History

Formed from the slow crystallization of magma below Earth's surface. This specimen has been rounded by fluvial (water) erosion. It can range in age from billions of years to relatively young in geological terms.

Uses & Applications

Used widely in construction as dimension stone, countertops, monuments, and as aggregate for roads and concrete. High collecting value for river stones used in decorative landscaping.

Geological Facts

Granite makes up the majority of the Earth's continental crust. It is primarily composed of quartz, feldspar, and mica minerals.

Field Identification & Locations

Identify in the field by its speckled 'salt and pepper' appearance and visible interlocking crystals. This rounded shape indicates it was recovered from a riverbed or beach. Found worldwide in continental plate regions.

Identified on: 4/18/2026

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