Where is Zebra Jasper found?
Zebra Jasper (a variety of Chalcedony, SiO2)
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Open the appZebra 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 Zebra Jasper
Western Australia
The most famous and significant deposits of Zebra Jasper (often referred to as 'Zebra Rock' in this region) are found in the East Kimberley region of Western Australia, particularly near Kununurra. These deposits are Proterozoic in age and are found within the Johnny Cake Shale Member of the Goonmurrah Formation.
Africa
Deposits have been reported in various African countries, including South Africa and Namibia, often associated with banded iron formations or other sedimentary sequences.
United States
Some jasper varieties with banding similar to Zebra Jasper can be found in various states, though not always with the same distinct contrast as the Australian material. Locations include parts of California, Oregon, and Idaho.
Other Localities
Similar banded chert or jasper formations can be found globally in regions with ancient sedimentary rock sequences, though the specific 'Zebra Jasper' designation is often reserved for the high-contrast material.
Collecting tips
- Geological Context. Look for areas with ancient sedimentary rock formations, particularly those known for chert, jasper, or banded iron formations. Zebra Jasper often occurs in association with these rock types.
- Outcrop Examination. Examine rock outcrops for distinctive banded patterns. The contrasting colors of white/cream and black/dark grey are usually quite visible on weathered surfaces.
- Hardness Test. Since it is a form of quartz, Zebra Jasper will scratch glass and steel. A Mohs hardness kit can confirm its hardness of 6.5-7.
- Fracture Pattern. Observe the fracture. Jasper typically exhibits a conchoidal (shell-like) fracture, which is characteristic of cryptocrystalline quartz.
- Associated Minerals. It may be found alongside other silica-rich minerals or iron-rich sedimentary rocks.
Quick Check
- Color:
- Alternating white/cream and black/dark grey/reddish-brown bands.
- Luster:
- Vitreous to dull.
- Streak:
- White (due to its quartz composition).
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