mineral

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

AI-generated identification · may be incorrect

Vivid translucent blue, vitreous luster, smooth rounded polish, conchoidal-looking fractures, and apparent bubbles/flow lines; hardness roughly 5–6 if glass. No visible crystal structure or cleavage.

Identified August 7, 2026More mineral →

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At a glance

Common name: Blue glass-like tumbled specimen
Scientific name: Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image
Category: mineral
Identified: August 7, 2026
Method: Standard

AI Estimated Value

About $2–$20 as a decorative tumbled glass piece; substantially more only if provenance proves it is a rare historical or archaeological glass artifact.

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

The abundant rounded bubbles and uniform blue color strongly suggest human-made glass, possibly decorative cullet or industrial slag, rather than a natural rock. It may be mistaken for blue obsidian, but natural blue obsidian is exceptionally rare.

Uses & applications

Used mainly as a decorative tumbled object or craft material; not suitable for standard gemstone identification or construction use. Value is generally aesthetic rather than mineralogical.

Geological facts

Blue color in glass commonly comes from cobalt; circular internal features are characteristic of trapped gas bubbles. A gemological test for refractive index and microscopic examination would distinguish it from natural minerals.

Field identification & locations

Inspect for bubbles, curved flow bands, sharp conchoidal chips, and uniform color; these favor glass. Natural blue minerals such as sodalite or azurite show crystals, grain, cleavage, or opaque matrix.