sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7.0 (Mohs); Color: Red, brown, and black with visible brecciation patterns; Luster: Vitreous to dull; Crystal structure: Hexagonal (Microcrystalline); Cleavage: None; Specific gravity: 2.6-2.9
- Hardness
- 6
- Color
- Red, brown, and black with visible brecciation patterns
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Red, brown, and black with visible brecciation patterns; Luster: Vitreous to dull; Crystal structure: Hexagonal (Microcrystalline); Cleavage: None; Specific gravity: 2.6-2.9
Formation & geological history
Formed when jasper is fractured by tectonic movement and then naturally cemented together by chalcedony or macrocrystalline quartz over millions of years, often in volcanic or sedimentary environments.
Uses & applications
Commonly used in lapidary arts for jewelry, cabochons, decorative beads, and ornamental carvings. It is also a popular stone in metaphysical collections and home decor.
Geological facts
The term brecciated comes from the Italian word 'breccia', which means 'gravel' or 'broken stones'. The red color is typically caused by high concentrations of iron oxide (hematite).
Field identification & locations
Identify in the field by its distinct 'jigsaw puzzle' appearance where angular fragments of red jasper are fused in a darker matrix. It is frequently found in desert regions and riverbeds across Australia, Brazil, and the Southwestern USA.
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