sedimentary
Breciated Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 on Mohs scale; Color: Deep brick red with inclusion of white or clear quartz veins; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Deep brick red with inclusion of white or clear quartz veins
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Deep brick red with inclusion of white or clear quartz veins; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica from water or hydrothermal fluids in cracks and fissures. The 'brecciated' look occurs when the original red jasper is fractured by tectonic activity and then re-cemented by white quartz or chalcedony over millions of years.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons, beads), decorative ornaments, and as a popular stone for tumbling and collectors due to its unique patterns.
Geological facts
Jasper is an opaque variety of chalcedony. The red color is caused by the presence of iron oxide (hematite). Many ancient cultures believed jasper had protective qualities and it was often used in amulets and cylinder seals.
Field identification & locations
Identify in the field by its characteristic red color and 'broken' appearance with white web-like veining. It is commonly found in desert regions of the SW United States, South Africa, and Brazil. It will not scratch with a steel knife but can scratch glass.
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