mineral
Ocean Jasper
Spherulitic Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7.0 (Mohs scale); Color: Polychromatic (green, yellow, brown, white); Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.6-2.7
- Hardness
- 6
- Color
- Polychromatic (green, yellow, brown, white)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Polychromatic (green, yellow, brown, white); Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.6-2.7
Formation & geological history
Formed in volcanic environments where silica-rich fluids precipitated in rhyolitic flow cavities. It is characterized by orbicular (spherical) inclusions and dates from the Mesozoic era.
Uses & applications
Primarily used for ornamental jewelry, lapidary cabochons, and as a popular specimen for crystal collectors and metaphysical use.
Geological facts
This specific variety of chalcedony is found only on the coast of Madagascar and can only be mined at low tide by boat, making it relatively rare.
Field identification & locations
Identify by its unique orbicular (eye-like) patterns and quartz-rich hardness. Found exclusively in the Analalava district of Madagascar.
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