sedimentary

Zebra Jasper

Tumbled Opaque Chalcedony (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Black and white or dark brown and cream banded/mottled; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.65.

Hardness: 6
Color: Black and white or dark brown and cream banded/mottled
Luster: Vitreous to waxy

Identified March 26, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Black and white or dark brown and cream banded/mottled; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.65.

Formation & geological history

Formed through the deposition of silica-rich groundwater in fissures of other rocks or sedimentary layers. The 'zebra' patterning is typically the result of mineral impurities (like iron oxides) and structural disturbances during the stone's formation hundreds of millions of years ago.

Uses & applications

Primary use is in jewelry (beads, cabochons), ornamental home decor, and 'healing stone' collections. It is also used as a tumbling material for lapidary hobbyists.

Geological facts

Despite the name 'Jasper,' many trade specimens are actually a form of marble or calcite-based stone, but true Zebra Jasper is a high-silica microcrystalline quartz. It was first found in Kununurra, Western Australia.

Field identification & locations

Identify in the field by its distinct high-contrast banding and 'conchoidal' (shell-like) fracture patterns if broken. It is commonly found in India, Russia, Africa, and Australia. Collectors should look for sharp color contrast and lack of visible pores.