sedimentary
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
Hardness: 6.5-7 (Mohs scale); Color: Variegated red (iron oxides), grey-green (chlorite/epidote), and white (quartz/calcite veins); Luster: Vitreous to dull; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Variegated red (iron oxides), grey-green (chlorite/epidote), and white (quartz/calcite veins); Luster: Vitreous to dull; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9.
Formation & geological history
Formed through the fracturing of original rock layers due to tectonic activity or weathering, followed by the cementation of these angular fragments (clasts) by silica-rich or carbonate-rich fluids during diagenesis.
Uses & applications
Commonly used for lapidary work (cabochons, beads), decorative stone in landscaping, architectural accents, and as a collector's specimen for its unique patterns.
Geological facts
Breccias are often 'healed' rocks that tell a story of seismic events. The red coloration specifically suggests the presence of hematite during the formation process. This specific type of blocky, multi-colored jasper is often referred to locally as 'Poppy Jasper' or 'Orbicular Jasper' if the patterns are more rounded.
Field identification & locations
Identify by looking for sharp, angular fragments of different colors held together by a 'matrix' or veins. It is commonly found in coastal areas, riverbeds, and mountainous regions like the California Coast Ranges. Collectors should look for high contrast between the fragments and the vein material.
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