sedimentary

Jasper Breccia

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: tan, orange, red, and dark green/black clasts; Luster: waxy to vitreous; Structure: microcrystalline quartz (chalcedony); Cleavage: none, conchoidal fracture

Hardness: 6
Color: tan, orange, red, and dark green/black clasts
Luster: waxy to vitreous

Identified July 16, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: tan, orange, red, and dark green/black clasts; Luster: waxy to vitreous; Structure: microcrystalline quartz (chalcedony); Cleavage: none, conchoidal fracture

Formation & geological history

Formed when existing jasper or chert deposits were broken by tectonic movement and later cemented together by silica-rich hydrothermal fluids. Often found in volcanic and sedimentary sequences worldwide.

Uses & applications

Used primarily in lapidary work for cabochons, decorative carvings, aquarium stones, 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 a chaotic, mosaic-like pattern unique to each stone.

Field identification & locations

Identify by its hardness (cannot be scratched by a knife), conchoidal fracture, and the distinctive 'broken and healed' appearance. This specimen has been polished to reveal the internal structure.