Where is Banded Chert found?
Chert (variety Jasper)
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Open the appBanded Chert 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 Banded Chert
Hamersley Basin, Western Australia
Famous for its extensive Precambrian Banded Iron Formations (BIFs), which contain significant amounts of banded jasper and chert.
Lake Superior Region, USA/Canada
Another prominent location for Precambrian BIFs, yielding banded chert and jasper.
California, USA
Various localities, particularly in the Franciscan Complex, contain radiolarian cherts, some of which are banded and jasper-like.
Russia (Urals)
Known for various types of jasper, including banded varieties.
Egypt
Historically significant source of chert and jasper, used since ancient times.
Collecting tips
- Look in Sedimentary Sequences. Search for banded chert in areas with exposed marine sedimentary rocks, especially those containing iron formations or ancient deep-sea deposits.
- Examine Road Cuts and River Beds. These exposures often reveal layers of chert. Look for distinct color banding.
- Check for Hardness. Chert is very hard (Mohs 7). It will scratch glass and steel. This helps distinguish it from softer sedimentary rocks.
- Observe Fracture. A characteristic conchoidal (shell-like) fracture is a strong indicator of chert.
- Look for Associated Minerals. In BIFs, banded chert will be interlayered with iron oxides (hematite, magnetite). In other settings, it might be found with limestone or shale.
Quick Check
- Color:
- Banded (red, brown, yellow, green)
- Luster:
- Dull to waxy/vitreous
- Streak:
- White
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