sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite and Quartz inclusions
Hardness: 6.5-7 (Mohs); Color: Red, brown, and brick-red with black, gray, or white veining; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Red, brown, and brick-red with black, gray, or white veining
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Red, brown, and brick-red with black, gray, or white veining; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58–2.91
Formation & geological history
Formed when jasper (a form of chalcedony) is fragmented through tectonic activity and then 'cemented' back together by subsequent mineral-rich fluids, typically silica or hematite, filling the cracks (brecciation). These are typically found in sedimentary formations spanning various geological eras, most frequently from the Precambrian or Paleozoic.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative lapidary arts, metaphysical uses (crystals), and small-scale ornamental carvings.
Geological facts
The word 'breccia' comes from the Italian for 'loose gravel.' It is unique because it displays both the original stone and the process of its destruction and reformation. Ancient civilizations used it for seals and protection amulets.
Field identification & locations
Identify in the field by its opaque nature, 'broken' or fragmented pattern (angular clasts), and high hardness—it will not be scratched by a steel knife. It is commonly found in the United States (CA, OR, WA), Brazil, and South Africa. Collectors should look for vibrant contrast between the clasts and the filler material.
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