mineral

Polished turquoise-colored stone, likely chrysoprase or dyed agate

Uncertain; possible chalcedony (microcrystalline SiO₂) or turquoise (hydrous copper aluminum phosphate)

AI-generated identification · may be incorrect

Opaque blue-green, waxy to dull luster, with a roughly sawn and polished face; apparent hardness about Mohs 6–7 if chalcedony, or 5–6 if turquoise. The image alone cannot confirm composition, texture, or specific gravity.

Identified August 25, 2026More mineral →

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At a glance

Common name: Polished turquoise-colored stone, likely chrysoprase or dyed agate
Scientific name: Uncertain; possible chalcedony (microcrystalline SiO₂) or turquoise (hydrous copper aluminum phosphate)
Category: mineral
Identified: August 25, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a common treated or unidentified piece; $30–$200+ if verified natural, attractive turquoise or chrysoprase.

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

If chalcedony, it formed from silica-rich fluids filling cavities in volcanic rocks, commonly during the Cenozoic; if turquoise, it formed by secondary copper-phosphate alteration, often in arid climates. Geological age is indeterminate from the photograph.

Uses & applications

Used as a cabochon, carving material, ornamental stone, or lapidary rough; turquoise is valued in jewelry, while common dyed or low-grade material has modest decorative value.

Geological facts

The vivid, uniform cyan color and slab-like shape may indicate dyed chalcedony, reconstructed turquoise, or another treated lapidary material rather than natural gem-quality turquoise.

Field identification & locations

Check hardness, streak, translucency at thin edges, and reaction to acetone or solvents; avoid destructive tests on valuable material. Common possibilities occur in Brazil, Madagascar, Australia, the southwestern United States, and Iran.