Where is Brecciated Jasper found?
Brecciated Jasper (a variety of Chalcedony)
Got a photo? Identify rocks instantly with the Rockby app
Open the appBrecciated Jasper occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Brecciated Jasper
Australia
Known for various types of jasper, including brecciated forms, particularly in Western Australia.
Brazil
Significant deposits of chalcedony and jasper varieties, including brecciated forms.
United States
Found in several states, including Oregon, Idaho, and California, often in association with volcanic activity or sedimentary chert beds.
Madagascar
Produces a wide range of ornamental jaspers, some of which exhibit brecciated textures.
South Africa
Known for various jasper types, including those with brecciated structures.
Collecting tips
- Look for Tectonic Zones. Areas with historical or active faulting, folding, or other tectonic disturbances are prime locations for breccia formation.
- Examine Hydrothermal Alteration Zones. Jasper can be formed or altered by hydrothermal fluids, and these areas can also lead to brecciation and subsequent cementation.
- Check Sedimentary Deposits. Look in chert beds, ancient riverbeds, or areas where collapse breccias might have formed.
- Identify Characteristic Patterns. The angular fragments and contrasting matrix are key visual identifiers. Look for sharp, broken pieces cemented together.
- Test Hardness. Jasper is relatively hard (Mohs 6.5-7), so it will scratch glass and will not be easily scratched by a steel knife.
Quick Check
- Color:
- Angular fragments of red, brown, yellow jasper cemented by a contrasting matrix.
- Luster:
- Dull to waxy.
- Streak:
- White.
Explore Brecciated Jasper
Identify rocks anywhere
Free on iOS, Android, and Web. Photo identification, full database, and your personal collection.