Quartzite and Jasper Pebbles

Physical Properties

Hardness: 6.5-7 (Mohs), Color: red, pink, brown, and grey, Luster: dull to vitreous, Crystal Structure: trigonal/hexagonal micro-textures, Specific Gravity: approx. 2.65

Formation & Geological History

Formed from the regional or contact metamorphism of quartz-rich sandstone. Most specimens in river gravels are aged between dozens to hundreds of millions of years old.

Uses & Applications

Used for landscaping, decorative garden stones, tumbling, lapidary work, and as high-quality construction aggregate.

Geological Facts

These pebbles are rounded due to fluvial erosion, meaning they were shaped by the movement of water over a long period. Many of the red hues come from trace inclusions of hematite.

Field Identification & Locations

Identify in the field by their extreme hardness (they will scratch glass) and lack of visible mineral grains. Commonly found in riverbeds, glacial tills, and shorelines worldwide.

Identified on: 4/30/2026

Mode: Standard