sedimentary
Jasper Breccia
Silicon Dioxide (SiO2) - Brecciated Microcrystalline Quartz
Hardness: 6.5-7 (Mohs scale); Color: Red, maroon, grey, and black; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Red, maroon, grey, and black
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Red, maroon, grey, and black; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.6-2.9.
Formation & geological history
Formed when jasper is fractured by tectonic movement and subsequently 'cemented' back together by mineral-laden fluids, usually silica or hematite. Commonly associated with Precambrian or Paleozoic geological environments.
Uses & applications
Used primarily for lapidary work, jewelry (cabs/beads), decorative ornaments, and as a popular specimen for collectors.
Geological facts
Breccia comes from the Italian word for 'rubble'. Brecciated Jasper is often referred to as 'Poppy Jasper' when it features orbicular patterns, or 'Brecciated Red Jasper' when it shows the angular blocky patterns seen in this specimen.
Field identification & locations
Identify by its 'shattered' look with angular fragments of red jasper held together by darker veins. Commonly found in riverbeds or beaches in regions like California, USA, or South Africa.
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