sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Red with grey/black/white veins, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Red with grey/black/white veins, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.9
Formation & geological history
Formed when jaspers are broken up by tectonic activity and later re-cemented together with other minerals like hematite or quartz. It is typically found in sedimentary and metamorphic environments and can date back hundreds of millions of years.
Uses & applications
Used primarily for lapidary work, jewelry, decorative carvings, architectural veneers, and as a popular metaphysical or collectors' stone.
Geological facts
The term 'brecciated' comes from the Italian word 'breccia', meaning broken stones or rubble. It is often referred to as 'Poppy Jasper' when the fragments form circular patterns.
Field identification & locations
Identify by its characteristic 'jigsaw' appearance where dark red angular fragments are held together by a different colored matrix. It is commonly found in areas such as California, South Africa, and Brazil. Collectors should look for a smooth finish and a lack of visible surface pits.
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