sedimentary
Orbicular Jasper
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 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
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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.
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