Quartz Pebble (Water-worn)

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent tan; Luster: Vitreous to waxy (when weathered); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed through hydrothermal processes or igneous activity, subsequently weathered and smooth-tumbled by water in a river or coastal environment over thousands of years.

Uses & Applications

Used in glass manufacturing, abrasives, landscaping, and as a material for quartz stone countertops. High-quality specimens are used in electronics for their piezoelectric properties.

Geological Facts

Quartz is one of the most abundant minerals in the Earth's crust and is a major component of sand. This specific specimen shows a small vug or hollow cavity where small crystals may have grown.

Field Identification & Locations

Identify by its ability to scratch glass and lack of reaction to acid. Look for the characteristic conchoidal fracture if the stone is chipped. Commonly found in riverbeds, beaches, and glacial till worldwide.

Identified on: 4/27/2026

Mode: Standard