mineral

Orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; commonly classified as orbicular jasper

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; gray, brown, cream, and reddish colors with rounded orbicular patterns; opaque, waxy to dull luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture.

Identified August 9, 2026More mineral →

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At a glance

Common name: Orbicular jasper (likely ocean jasper)
Scientific name: Silica-rich microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; commonly classified as orbicular jasper
Category: mineral
Identified: August 9, 2026
Method: Standard

AI Estimated Value

$5–$30 for a common hand specimen; $30–$150+ for vividly patterned, polished, or provenance-confirmed 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 or hydrothermal fluids replace or cement rock, while concentric mineral growth creates the orbs. Ocean jasper is especially associated with Miocene volcanic rocks of Madagascar, though similar orbicular jaspers occur elsewhere.

Uses & applications

Used as a lapidary material for cabochons, beads, carvings, polished spheres, and ornamental specimens; rarely used industrially because of its decorative value.

Geological facts

The specimen’s rounded contrasting patches and siliceous appearance strongly suggest orbicular jasper, but a precise variety requires closer inspection or testing.

Field identification & locations

Look for opaque chalcedony, hardness near quartz, conchoidal fracture, and naturally rounded orb patterns; common sources include Madagascar, Mexico, Indonesia, and Oregon. Avoid confusing it with dyed agate or slag.