mineral

Tumbled pink-and-cream stone, possibly pink opal

Likely common opal (hydrated amorphous silica, SiO₂·nH₂O); identification is uncertain from the photo

AI-generated identification · may be incorrect

Smooth, rounded, opaque cream stone with faint pink-red mottling and a dull to waxy luster. If opal, hardness is about 5.5–6.5 Mohs and it has no cleavage or crystal structure; the image alone cannot confirm this.

Identified October 11, 2026More mineral →

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At a glance

Common name: Tumbled pink-and-cream stone, possibly pink opal
Scientific name: Likely common opal (hydrated amorphous silica, SiO₂·nH₂O); identification is uncertain from the photo
Category: mineral
Identified: October 11, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small, common tumbled stone; higher prices require confirmed identity and attractive quality.

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

Common opal forms when silica-rich groundwater deposits hydrated silica in rock cavities or fractures; deposits range from recent to geologically ancient. Pink coloration may result from trace iron or other impurities.

Uses & applications

Tumbled opal and similar stones are used in beads, cabochons, and decorative collections; common material has little industrial use.

Geological facts

Common opal is non-crystalline and does not display the rainbow play-of-color characteristic of precious opal. Similar-looking tumbled stones include dyed quartz and jasper.

Field identification & locations

A scratch, hardness, or close inspection would help distinguish opal from jasper or treated material; opal is found in many silica-rich volcanic and sedimentary regions, including Australia, Mexico, and the western United States.