sedimentary
Jasper Breccia
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale); Color: Red, yellow, brown, and tan; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Red, yellow, brown, and tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Red, yellow, brown, and tan; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.6-2.9
Formation & geological history
Formed when jasper is fractured by tectonic activity and then cemented back together by silica or other minerals over millions of years. This specimen shows water-worn, smoothed surfaces, likely from river transport.
Uses & applications
Used in gemstone carvings, jewelry (cabochons), lapidary art, and as a decorative stone in landscaping or interior design.
Geological facts
The word jasper is derived from the Greek iaspis, meaning 'spotted stone.' Brecciated varieties are particularly prized for their mosaic-like patterns caused by the broken and re-healed fragments.
Field identification & locations
Identify in the field by its hardness (will scratch glass), opaque nature even on thin edges, and angular internal fragments. Commonly found in river beds and sedimentary deposits globally.
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