sedimentary
Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
Hardness: 6.5-7 (Mohs scale); Color: Distinctive black and white or dark grey and white banding/mottling; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Distinctive black and white or dark grey and white banding/mottling; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9.
Formation & geological history
Formed from silica-rich groundwater percolating through sedimentary rocks or volcanic ash, depositing microcrystalline quartz in layers. The contrasting colors result from different mineral inclusions like iron oxides or carbonaceous material during the consolidation process.
Uses & applications
Primarily used for lapidary work, including cabochons, tumbled stones for jewelry, decorative carvings, and as a popular metaphysical or 'healing' stone in spiritual practices.
Geological facts
Despite being called 'Jasper', it is technically a variety of chalcedony. The name 'Zebra' originates from the stark, high-contrast patterns that mimic a zebra's stripes. It has been used for centuries across various cultures for talismans and amulets.
Field identification & locations
Identify in the field by its high hardness (it will scratch glass) and its opaque, high-contrast, irregular monochromatic banding. Commonly found in large deposits in Brazil, India, Russia, and the United States (specifically Utah). Collectors look for sharp contrast between the light and dark segments.
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