mineral
Ocean Jasper (Tumbled/Polished)
Silicon Dioxide (Microcrystalline Quartz) - SiO2
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Earthy tones of tan, brown, and cream with orbicular (circular) patterns; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None/Conchoidal fracture.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Earthy tones of tan, brown, and cream with orbicular (circular) patterns; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed through the accumulation of volcanic ash and silica-rich fluids that solidify into rhyolite or chalcedony. The orbicular patterns are the result of radial growth of needle-like quartz and feldspar crystals.
Uses & applications
Used primarily in lapidary arts, jewelry making (cabochons), interior decoration, and as a popular specimen for metaphysical collectors.
Geological facts
This specific variety, often called 'Ocean Jasper', is famous for being found only on the coast of Madagascar. True Ocean Jasper veins are often only reachable by boat and can only be mined during low tide.
Field identification & locations
Identify by its distinctive 'eyes' or circular orb patterns and waxy surface when polished. Found naturally in Madagascar; collectors should look for vibrant color combinations and well-defined orbs.
