Quartz Pebble

Physical Properties

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

Formation & Geological History

Formed through hydrothermal processes or crystalization from magma. This specific specimen has been secondary-weathered and water-worn (tumbled) in a fluvial (river) or coastal environment, giving it a smooth, rounded shape.

Uses & Applications

Used as decorative garden mulch, in construction as an aggregate, in jewelry as semi-precious tumbled stones, and as high-quality silica for glassmaking and electronics.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. White or 'milky' quartz gets its color from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and smooth, rounded surface if found near water. Extremely common globally in riverbeds and on beaches.

Identified on: 4/19/2026

Mode: Standard