gemstone

Blue-green tumbled stone, possibly turquoise

Unidentified opaque copper-bearing mineral; turquoise is a candidate (CuAl₆(PO₄)₄(OH)₈·4H₂O)

AI-generated identification · may be incorrect

Small, opaque, blue-to-turquoise piece with a smooth, glossy surface and irregular shape. If turquoise, it has Mohs hardness 5–6 and a triclinic crystal structure; the photo is not sufficient to confirm the mineral or its properties.

Identified October 15, 2026More gemstone →

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Physical properties

Formation & geological history

Turquoise forms as a secondary mineral in oxidized, copper-rich deposits, commonly in arid regions. The specimen appears shaped or polished, so its original formation age and source cannot be determined visually.

Uses & applications

Turquoise is used in jewelry and carvings; other blue-green tumbled minerals are mainly decorative or collectible.

Geological facts

The blue-green color is consistent with turquoise, but dyed howlite, chrysocolla, and other minerals can look similar. The reported southern California location makes turquoise geologically plausible, but does not establish this specimen’s origin.

Field identification & locations

A field identification would need tests such as hardness, streak, and examination for matrix or distinctive texture; avoid destructive tests on a potentially valuable piece. Value is indeterminate from the image: roughly $1–$20 for a small common tumbled stone, potentially more if verified as quality turquoise.