mineral

Tumbled ocean jasper (orbicular jasper), possibly chrysoprase-bearing

Microcrystalline quartz (SiO₂), with chalcedony, iron oxides, and green mineral inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent pale green to gray with rusty red-brown patches; waxy to vitreous luster; cryptocrystalline quartz with no visible cleavage; typical specific gravity about 2.6.

Identified August 19, 2026More mineral →

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At a glance

Common name: Tumbled ocean jasper (orbicular jasper), possibly chrysoprase-bearing
Scientific name: Microcrystalline quartz (SiO₂), with chalcedony, iron oxides, and green mineral inclusions
Category: mineral
Identified: August 19, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a small tumbled piece; $30–$100+ for unusually vivid, patterned, or translucent specimens.

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

Hardness 6.5–7 Mohs; translucent pale green to gray with rusty red-brown patches; waxy to vitreous luster; cryptocrystalline quartz with no visible cleavage; typical specific gravity about 2.6.

Formation & geological history

Forms when silica-rich fluids fill cavities and fractures in volcanic rocks, later incorporating iron-oxide and other mineral inclusions. Most ocean jasper formed in Madagascar’s Oligocene–Miocene volcanic rocks, roughly 5–30 million years ago.

Uses & applications

Used primarily as a lapidary and collector stone for cabochons, carvings, beads, and polished specimens; not generally used structurally.

Geological facts

The rounded, smooth surface indicates tumbling or water wear. Green coloration may reflect chalcedony, celadonite, or other inclusions rather than true chrysoprase.

Field identification & locations

Identify by its opaque-to-translucent chalcedony body, curved fracture, hardness, and rusty iron staining; acid does not fizz. Classic orbicular patterns are especially associated with northwest Madagascar, while similar material occurs worldwide.