mineral

Polished yellow-green chalcedony (likely serpentine or quartz pebble)

Microcrystalline quartz, SiO₂ (if chalcedony); possible antigorite/lizardite, Mg₃Si₂O₅(OH)₄ (if serpentine)

AI-generated identification · may be incorrect

Smooth tumbled, waxy-to-glassy luster, pale yellow-green with orange-brown inclusions, no visible cleavage; estimated Mohs hardness 6.5–7 for chalcedony or 2.5–5.5 for serpentine. Rounded shape indicates polishing or water wear.

Identified August 13, 2026More mineral →

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At a glance

Common name: Polished yellow-green chalcedony (likely serpentine or quartz pebble)
Scientific name: Microcrystalline quartz, SiO₂ (if chalcedony); possible antigorite/lizardite, Mg₃Si₂O₅(OH)₄ (if serpentine)
Category: mineral
Identified: August 13, 2026
Method: Standard

AI Estimated Value

About $3–$20 as a common polished pebble; $20–$75 if unusually attractive, translucent, or sold as a quality cabochon.

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

Chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; serpentine forms by hydrothermal alteration of ultramafic rocks. Precise age and identification require hardness, streak, and specific-gravity testing.

Uses & applications

Used as a decorative tumbled stone, cabochon, bead, or carving material; chalcedony is more durable for jewelry, while serpentine is mainly ornamental. Common tumbled specimens generally have modest value.

Geological facts

The translucent, waxy appearance is consistent with chalcedony, but the unusually yellow-green body color can also indicate serpentine or iron-bearing quartz. Photography alone cannot reliably distinguish these materials.

Field identification & locations

Common sources include volcanic terrains for chalcedony and ultramafic belts such as California, New Zealand, Canada, and Italy for serpentine. A steel file or quartz scratch test helps: chalcedony scratches glass; softer serpentine usually does not.