sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brown and tan with white veinlets, Luster: Dull to waxy/vitreous when polished, Crystal structure: Microcrystalline (trigonal system), Cleavage: None, Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brown and tan with white veinlets, Luster: Dull to waxy/vitreous when polished, Crystal structure: Microcrystalline (trigonal system), Cleavage: None, Specific Gravity: 2.6-2.9
Formation & geological history
Formed when original Jasper or Chert is broken apart by tectonic activity or hydraulic pressure and then 're-cemented' together by flowing groundwater rich in silica (Chalcedony) or Calcite. This specimen shows water-worn rounding.
Uses & applications
Commonly used for lapidary work, making cabochons, jewelry, decorative tumbled stones, and as a 'grounding stone' in metaphysical practices.
Geological facts
The term 'brecciated' comes from the Italian word 'breccia', meaning broken gravel or stone. It is essentially a natural mosaic made of older rock fragments.
Field identification & locations
Identify by its angular fragments and crisscrossing veins. It is commonly found in gravel pits, riverbeds, and desert regions worldwide, particularly in areas with a history of seismic activity.
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