mineral

Yellow chalcedony (likely polished/tumbled pieces)

Microcrystalline quartz, SiO₂; commonly called yellow jasper or silicified limestone depending on exact texture

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, pale yellow to ochre with gray-brown banding, waxy to dull luster, cryptocrystalline structure, and no visible cleavage; specific gravity about 2.6. The pieces appear cut or naturally flattened and polished, with iron-oxide staining and possible sedimentary inclusions.

Identified August 31, 2026More mineral →

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At a glance

Common name: Yellow chalcedony (likely polished/tumbled pieces)
Scientific name: Microcrystalline quartz, SiO₂; commonly called yellow jasper or silicified limestone depending on exact texture
Category: mineral
Identified: August 31, 2026
Method: Standard

AI Estimated Value

About $5–$30 for this small group; higher-quality patterned or translucent pieces may sell for $20–$100 individually.

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 fluids fill cavities, fractures, or porous sediment and later harden into chalcedony/jasper; the banding may reflect changing fluid chemistry. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used for cabochons, beads, carvings, lapidary specimens, and decorative stone; comparable common pieces generally have modest value.

Geological facts

Chalcedony is quartz made of extremely small interlocking crystals, so it often breaks with a smooth, curved fracture rather than showing quartz crystal faces.

Field identification & locations

Identify by its waxy appearance, very high hardness, fine-grained texture, and inability to scratch it with a steel knife; vinegar will not fizz unless carbonate matrix is present. Similar material occurs worldwide, including Brazil, India, Madagascar, Mexico, and the western United States.