sedimentary

Jasper-Agate Breccia

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Ochre, rust red, and translucent white; Luster: Vitreous/Waxy; Crystal Structure: Cryptocrystalline/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Ochre, rust red, and translucent white
Luster: Vitreous/Waxy

Identified March 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by the deposition of silica-rich fluids into cavities or fractures in host rock. These fluids cement together broken fragments of jasper and chalcedony. Many high-quality specimens date from the Cenozoic era or older, typically found in volcanic regions or ancient riverbeds.

Uses & applications

Commonly used in lapidary arts for cabochons, pendants, and decorative carvings. It is also favored by mineral collectors for its unique mosaic-like patterns.

Geological facts

Brecciated stones are naturally 'healed' by geological processes where earth movements break the stone and mineralized silica acts as a glue, creating a distinct patchwork appearance. No two pieces are ever identical.

Field identification & locations

Identify by its multi-colored, angular fragments bonded by a different colored matrix. It is found globally, with significant deposits in the USA (Oregon, Idaho), Madagascar, and Brazil. Collectors look for sharp contrast and high polish.