mineral
Tumbled blue glassy mineral specimen, possibly blue calcite or dyed quartz
Uncertain from image; likely calcite (CaCO₃) or dyed microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectSmall, rounded and polished, with vivid blue color, pale translucent edges, and a vitreous to waxy luster. Calcite has Mohs hardness 3 and rhombohedral cleavage; quartz has hardness 7 and no cleavage; these cannot be distinguished reliably from the photograph.
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Physical properties
Small, rounded and polished, with vivid blue color, pale translucent edges, and a vitreous to waxy luster. Calcite has Mohs hardness 3 and rhombohedral cleavage; quartz has hardness 7 and no cleavage; these cannot be distinguished reliably from the photograph.
Formation & geological history
Likely a human-polished or tumbled geological material; natural blue coloration could result from minerals such as chrysocolla, azurite, or dumortierite, while uniform color may indicate dyeing. Geological age and formation environment are undetermined.
Uses & applications
Used mainly as a decorative or metaphysical collectible; quality natural blue minerals may be cut into cabochons, but this small piece has little industrial value.
Geological facts
The frosted, smoothly rounded surface and translucent margins are consistent with tumbling. A steel knife or glass scratch test, streak test, and acid reaction can help distinguish calcite from quartz, though testing may damage it.
Field identification & locations
Commonly encountered in craft shops, rock collections, and beach-glass-style tumbling; likely not identifiable to species without hardness, streak, specific gravity, or chemical testing.
