mineral

Polished ocean jasper (orbicular jasper) heart

Microcrystalline quartz/chalcedony, mainly SiO₂, with iron-rich and other mineral inclusions

AI-generated identification · may be incorrect

Opaque gray-green with black, cream, and mottled orbicular patterns; waxy to vitreous luster and no visible cleavage. Hardness is approximately 6.5–7 Mohs; massive, cryptocrystalline structure and specific gravity around 2.6.

Identified August 25, 2026More mineral →

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At a glance

Common name: Polished ocean jasper (orbicular jasper) heart
Scientific name: Microcrystalline quartz/chalcedony, mainly SiO₂, with iron-rich and other mineral inclusions
Category: mineral
Identified: August 25, 2026
Method: Standard

AI Estimated Value

About $10–$40 for a small polished heart; $50–$150+ for unusually vivid patterns, larger size, or documented Madagascar material.

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

Forms when silica-rich volcanic fluids or ash are altered and cemented, producing chalcedony and radiating mineral patterns. Ocean jasper is primarily associated with Oligocene–Miocene volcanic rocks of Madagascar, roughly 5–30 million years old.

Uses & applications

Used for cabochons, carvings, beads, polished hearts, ornamental objects, and collector specimens; it has no major industrial use.

Geological facts

“Ocean jasper” is a trade name rather than a single precise mineral species; orbicular patterns are its most recognizable feature.

Field identification & locations

Identify it by its opaque chalcedony body, curved orb-like or brecciated patterns, glassy polish, and resistance to scratching by steel. Common sources include Madagascar, Mexico, Australia, and the western United States.