sedimentary

Brown Jasper (Water-worn pebble)

Silicon Dioxide (SiO2) with iron oxide impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Brown, tan, and creamy white patterns; Luster: Dull to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Opaque.

Hardness: 6
Color: Brown, tan, and creamy white patterns
Luster: Dull to waxy

Identified July 14, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Brown, tan, and creamy white patterns; Luster: Dull to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Opaque.

Formation & geological history

Formed from the precipitation of silica in sedimentary environments or volcanic ash, later rounded and smoothed by water erosion in a riverbed or beach. Ages vary widely from millions to billions of years.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons), collection, and as decorative gravel.

Geological facts

Jasper is a variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. The brown color is typically caused by goethite or iron oxides.

Field identification & locations

Identify by its hardness (cannot be scratched by a knife), opaque nature, and smooth water-worn texture. Commonly found in riverbeds, lakeshores, and coastal areas worldwide.