mineral

Polished Ocean Jasper cabochon

Orbicular chalcedony (microcrystalline quartz, SiO₂), commonly with feldspar, zeolites, and iron-oxide inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; opaque to translucent, with cream, gray-green, brown, and white orbicular patterns; waxy to vitreous luster and no visible cleavage. The specimen is shaped and highly polished, likely as a pendant or display slab.

Identified August 16, 2026More mineral →

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At a glance

Common name: Polished Ocean Jasper cabochon
Scientific name: Orbicular chalcedony (microcrystalline quartz, SiO₂), commonly with feldspar, zeolites, and iron-oxide inclusions
Category: mineral
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Approximately $10–$40 for a small polished piece; $50–$150+ for attractive, well-patterned cabochons or rare provenance.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Formed when silica-rich fluids filled cavities and replaced volcanic rock, producing concentric orbicules and brecciated patterns; associated with Oligocene–Miocene volcanic rocks. Classic material comes from coastal Madagascar.

Uses & applications

Used for cabochons, carvings, jewelry, polished slabs, and lapidary collecting; its value is primarily decorative rather than industrial.

Geological facts

“Ocean jasper” is a trade name, not a single formally defined mineral species. Orbicular patterns may arise from rhythmic silica deposition, spherulitic growth, or replacement textures.

Field identification & locations

Identify it by its rounded orbicules, fine-grained quartz texture, and hardness; it should resist scratching by steel and show no cubic cleavage. Common sources include Madagascar, Mexico, Australia, and Indonesia, though Madagascar material is especially collectible.