mineral

Tumbled yellow-green chalcedony or serpentine

Microcrystalline quartz (SiO₂), possibly chrysoprase; alternative: serpentine-group mineral

AI-generated identification · may be incorrect

Translucent yellow-green, smooth tumbled surface, vitreous-to-waxy luster, no obvious cleavage, and likely hardness about 6.5–7 if chalcedony (lower, about 2.5–5.5, if serpentine). The image alone cannot reliably distinguish these possibilities.

Identified August 27, 2026More mineral →

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At a glance

Common name: Tumbled yellow-green chalcedony or serpentine
Scientific name: Microcrystalline quartz (SiO₂), possibly chrysoprase; alternative: serpentine-group mineral
Category: mineral
Identified: August 27, 2026
Method: Standard

AI Estimated Value

Approximately $1–$15 for a small common tumbled piece; $20–$100+ if confirmed high-quality chrysoprase or an attractive polished 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

Chalcedony forms when silica-rich fluids fill cavities and fractures, commonly in volcanic rocks; serpentine forms by hydration and alteration of ultramafic rocks. Both are geologically ancient and occur in many environments.

Uses & applications

Used as a lapidary stone, cabochon, bead, or inexpensive collectible; chrysoprase-quality material can be used in jewelry. Serpentine is also used decoratively and occasionally as a carving stone.

Geological facts

The yellow-green color may result from nickel-bearing minerals, iron staining, or coloration of a processed specimen. It appears natural rather than manufactured, but identification requires testing.

Field identification & locations

Check hardness with a steel knife or quartz point, streak, translucency, and specific gravity; chalcedony resists scratching by steel, whereas serpentine usually does not. Common sources include Brazil, India, Madagascar, Australia, and the United States.