sedimentary
Jasper-Agate Breccia
Silicon Dioxide (SiO2) with iron oxide inclusions
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
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Physical properties
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
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.
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