sedimentary
Zebra Jasper (Zebra Stone)
Silicon Dioxide (SiO2) with iron oxide and manganese inclusions
Hardness: 6.5-7 (Mohs scale); Color: Dark brown or black and beige/white banding; Luster: Vitreous to dull; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Dark brown or black and beige/white banding
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Dark brown or black and beige/white banding; Luster: Vitreous to dull; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich sediments in shallow marine environments. Over millions of years, these sediments are compressed and lithified, with rhythmic banding resulting from changing mineral concentrations during deposition. Most specimens date back to the Precambrian era, over 600 million years ago.
Uses & applications
Predominantly used as a decorative stone, for cabochons in jewelry, pocket stones (worry stones), and interior design accents like tiles or carved figurines.
Geological facts
Despite being called 'Jasper' in the trade, it is often a mixture of quartz and calcium carbonate or clay minerals. It is sometimes famously referred to as 'Zebra Marble' or 'Zebra Agate' in different regions, though the banding is its most definitive visual trait.
Field identification & locations
Identify in the field by its distinct high-contrast rhythmic striping and its inability to be scratched by a steel knife. It is most commonly found in Western Australia, but deposits also exist in Africa, Brazil, and the USA.
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