sedimentary

Jasper Breccia

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs). Color: Tan, brown, ochre, and black veins. Luster: Dull/Waxy (but polished in photo). Crystal structure: Microcrystalline/Trigonal. Cleavage: None, conchoidal fracture.

Hardness: 6
Color: Tan, brown, ochre, and black veins
Luster: Dull/Waxy (but polished in photo)

Identified April 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs). Color: Tan, brown, ochre, and black veins. Luster: Dull/Waxy (but polished in photo). Crystal structure: Microcrystalline/Trigonal. Cleavage: None, conchoidal fracture.

Formation & geological history

Formed when jasper or chert is fractured by tectonic movements and subsequently cemented together by secondary silica or iron oxides in hydrothermal environments.

Uses & applications

Primarily used for lapidary work, jewelry, decorative cabochons, and as a collector's specimen due to its unique patterns.

Geological facts

The word 'breccia' comes from Italian, meaning 'loose gravel' or 'broken stone'. No two pieces are identical because the fracturing and re-cementing process creates chaotic, unique patterns.

Field identification & locations

Identify by its hardness (cannot be scratched by a steel knife) and the visible angular fragments of rock cemented together by a matrix. Commonly found in riverbeds or near volcanic-sedimentary contact zones.