mineral

Tumbled blue glass-like specimen, possibly dyed chalcedony or synthetic glass

Uncertain; possible dyed quartz/chalcedony (SiO₂), but appearance strongly suggests cobalt-blue glass

AI-generated identification · may be incorrect

Deep translucent cobalt-blue, vitreous luster, rounded/tumbled form, and apparent internal bubbles or flow lines. If quartz, hardness is about 7 Mohs; glass is typically 5–6, with no cleavage.

Identified September 1, 2026More mineral →

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At a glance

Common name: Tumbled blue glass-like specimen, possibly dyed chalcedony or synthetic glass
Scientific name: Uncertain; possible dyed quartz/chalcedony (SiO₂), but appearance strongly suggests cobalt-blue glass
Category: mineral
Identified: September 1, 2026
Method: Standard

AI Estimated Value

About $1–$15 if glass or dyed material; $10–$50 for a verified attractive dyed chalcedony piece. A genuine rare natural blue gemstone would require laboratory confirmation and could be worth substantially more.

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

Deep translucent cobalt-blue, vitreous luster, rounded/tumbled form, and apparent internal bubbles or flow lines. If quartz, hardness is about 7 Mohs; glass is typically 5–6, with no cleavage.

Formation & geological history

Natural blue chalcedony is uncommon and usually pale blue; vivid cobalt coloration is commonly produced by dyeing quartz or manufacturing glass. The specimen’s geological age cannot be determined from the image.

Uses & applications

Dyed chalcedony may be used for inexpensive ornaments and cabochons; cobalt glass is decorative. Likely limited construction or jewelry value unless confirmed as natural gemstone.

Geological facts

A sharp edge or conchoidal fracture, abundant round bubbles, and flow textures would favor glass. Quartz should scratch ordinary glass, whereas glass generally will not scratch quartz.

Field identification & locations

Check for bubbles, uniform color concentration in cracks, and an indistinct glassy fracture; test hardness cautiously and inspect with magnification. Natural blue quartz/chalcedony typically shows more variable color and mineral texture.