gemstone

Polished turquoise-like chalcedony or chrysoprase pebble

Cryptocrystalline quartz (SiO₂), possibly copper-bearing turquoise/chrysoprase; visual identification is uncertain

AI-generated identification · may be incorrect

Small rounded, polished specimen with brownish green-blue mottling and a glossy luster. Quartz varieties are Mohs 6.5–7; turquoise is softer, Mohs 5–6, and typically opaque with a waxy luster.

Identified September 17, 2026More gemstone →

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At a glance

Common name: Polished turquoise-like chalcedony or chrysoprase pebble
Scientific name: Cryptocrystalline quartz (SiO₂), possibly copper-bearing turquoise/chrysoprase; visual identification is uncertain
Category: gemstone
Identified: September 17, 2026
Method: Standard

AI Estimated Value

About $1–$15 as a small common tumbled stone; $20–$75 if confirmed natural, attractive, and gem-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

Small rounded, polished specimen with brownish green-blue mottling and a glossy luster. Quartz varieties are Mohs 6.5–7; turquoise is softer, Mohs 5–6, and typically opaque with a waxy luster.

Formation & geological history

Likely a tumbled or naturally water-worn silica-rich pebble, possibly stained by copper minerals or iron oxides. If chrysoprase, it formed in weathered nickel-rich ultramafic rocks; if turquoise, in arid-zone copper deposits.

Uses & applications

Used as a cabochon, bead, or decorative stone. Common-quality pieces generally have modest value.

Geological facts

The image does not show diagnostic crystal faces, matrix, or texture sufficient to distinguish turquoise, chrysoprase, jasper, or dyed material. A scratch test, density, and close inspection under neutral light would help.

Field identification & locations

At approximately 30.2°N, 92.3°W in southern Louisiana, a transported or commercially tumbled pebble is more plausible than locally formed turquoise or chrysoprase; the region is dominated by young sediments. Check for uniform dye concentration in cracks and test hardness only on an inconspicuous area.