sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Red, brown, and yellow with tan or grey inclusions; Luster: Vitreous to waxy; Structure: Microcrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
- Hardness
- 6
- Color
- Red, brown, and yellow with tan or grey inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Red, brown, and yellow with tan or grey inclusions; Luster: Vitreous to waxy; Structure: Microcrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
Formation & geological history
Forms when jasper is fractured due to tectonic activity and the cracks are subsequently filled with other minerals, typically chalcedony or quartz. This process can occur over millions of years in volcanic or sedimentary environments.
Uses & applications
Mainly used as a gemstone for jewelry, lapidary work (cabs and beads), decorative ornaments, and by mineral collectors for its unique patterns.
Geological facts
The term 'brecciated' comes from the Italian word 'breccia,' meaning broken gravel. It is often referred to as a 'stone of strength' in metaphysical circles due to its fragmented yet cohesive appearance.
Field identification & locations
Identified in the field by its high hardness (doesn't scratch with a steel knife), distinct matrix pattern of angular fragments, and smooth, often water-worn texture in stream beds.
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