sedimentary

Orbicular Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs); Color: Multi-colored with circular (orbicular) patterns; Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None; Specific Gravity: 2.6-2.9

Hardness: 6
Color: Multi-colored with circular (orbicular) patterns
Luster: Vitreous to waxy

Identified June 18, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Multi-colored with circular (orbicular) patterns; Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None; Specific Gravity: 2.6-2.9

Formation & geological history

Formed when silica-rich fluids precipitate in cavities of volcanic rock or sedimentary layers, creating concentric mineral growths. Many deposits are associated with ancient hydrothermal activity.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons), interior decoration, and as a popular collector's specimen.

Geological facts

Also known as 'Ocean Jasper' when found in specific coastal regions of Madagascar. The distinct 'eyes' or circles are spherulites created by radial needle-like crystal growth.

Field identification & locations

Identify by its non-transparent, opaque nature and distinctive circular patterns. Commonly found in coastal areas, Madagascar, and parts of the Pacific Northwest.