mineral

Honey-yellow chalcedony (likely common opal or silicified material)

Microcrystalline quartz, SiO₂; possibly hydrated silica opal, SiO₂·nH₂O

AI-generated identification · may be incorrect

Opaque honey-orange, waxy to dull luster, irregular fracture, and no visible cleavage; chalcedony has Mohs hardness 6.5–7, while opal is 5.5–6.5. The rounded shape and surface texture suggest a naturally water-worn or roughly polished specimen.

Identified September 14, 2026More mineral →

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At a glance

Common name: Honey-yellow chalcedony (likely common opal or silicified material)
Scientific name: Microcrystalline quartz, SiO₂; possibly hydrated silica opal, SiO₂·nH₂O
Category: mineral
Identified: September 14, 2026
Method: Standard

AI Estimated Value

$3–$20 for a common rough piece; approximately $20–$100 if unusually translucent, attractive, or confirmed as quality chalcedony.

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

Silica-rich groundwater deposited chalcedony or opal in cavities, fractures, or sedimentary settings; such deposits range from Cenozoic to much older. Exact age and identification require hardness, specific-gravity, and microscopic tests.

Uses & applications

Used as a lapidary material, ornamental stone, cabochons, carvings, and collectible specimens; translucent, patterned varieties may have modest jewelry value.

Geological facts

Orange coloration commonly comes from iron oxides or hydroxides. Chalcedony and opal can look similar, but opal is generally softer and less crystalline.

Field identification & locations

Commonly found in volcanic cavities, silica-rich sediments, and alluvial gravels worldwide, including Australia, Mexico, Brazil, and the western United States. A steel-file scratch test, specific gravity, and absence or presence of play-of-color help distinguish it from opal, jasper, and resin.