mineral

Polished/tumbled green jasper (probable serpentinized stone)

Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine minerals

AI-generated identification · may be incorrect

Opaque blue-green to olive-green with brown iron-oxide staining and a waxy-to-dull polish; typically Mohs 6.5–7 for jasper, though serpentine-rich material may be softer (2.5–5.5). Microcrystalline, with no visible cleavage and irregular fracture; specific gravity commonly about 2.5–2.8.

Identified September 2, 2026More mineral →

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At a glance

Common name: Polished/tumbled green jasper (probable serpentinized stone)
Scientific name: Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine minerals
Category: mineral
Identified: September 2, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled stone; $20–$75 for an unusually attractive polished cabochon or verified locality specimen.

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

Jasper forms when silica-rich fluids replace or cement volcanic sediment and breccia; green coloration may reflect chlorite, epidote, or serpentine, while brown areas are iron oxides. Such material is generally Precambrian to Cenozoic, depending on locality.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and ornamental objects; attractive examples are popular with collectors but usually have modest value.

Geological facts

The specimen’s mottled green-brown pattern and smooth rounded shape indicate human tumbling or polishing. Exact identification requires hardness, streak, and perhaps thin-section or chemical testing.

Field identification & locations

Common in volcanic and hydrothermal terrains, including Oregon, California, Arizona, Australia, and South Africa. Test cautiously with a steel blade and quartz: true jasper resists scratching and leaves a white streak.