sedimentary

Orbicular Jasper (Ocean Jasper tendency)

Silicon Dioxide (SiO2) with impurities

Hardness: 6.5-7 Mohs; Color: Green, cream, and grey with orbicular patterns; Luster: Dull to waxy; Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.6-2.9

Hardness: 6
Color: Green, cream, and grey with orbicular patterns
Luster: Dull to waxy

Identified April 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by the deposition of silica from hydrothermal solutions or within volcanic cavities and sedimentary layers. The orbicular patterns (eyes) are created by needle-like crystals of quartz or feldspar growing in a radial fashion around a nucleus.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons), tumbled stones, and as metaphysical or decorative display specimens for collectors.

Geological facts

Jasper is a variety of chalcedony. The 'orbicular' or 'eye' patterns are caused by circular inclusions of different mineral compositions, and they are highly sought after by collectors for their unique aesthetic patterns.

Field identification & locations

Identify by its circular, bullseye-like patterns and high hardness (it won't be scratched by a steel knife). Commonly found in Madagascar and parts of the Pacific Northwest in the USA.

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