mineral

Tumbled blue-green stone, likely chrysocolla or dyed chalcedony

Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony

AI-generated identification · may be incorrect

Polished/tumbled, opaque to translucent blue-green surface with dark matrix and vitreous-to-waxy luster. Chrysocolla is typically Mohs 2–4 and noncrystalline/microcrystalline; chalcedony is Mohs 6.5–7, so hardness testing is useful.

Identified August 11, 2026More mineral →

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At a glance

Common name: Tumbled blue-green stone, likely chrysocolla or dyed chalcedony
Scientific name: Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony
Category: mineral
Identified: August 11, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled piece; $20–$100+ if natural, strongly patterned, 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

Formation & geological history

Chrysocolla forms as a secondary copper mineral in oxidized zones of copper deposits, commonly during the Cenozoic or older weathering cycles. Chalcedony forms when silica-rich groundwater fills cavities and fractures, later being colored or artificially dyed.

Uses & applications

Used primarily as a lapidary and collectible stone; attractive chrysocolla may be made into cabochons, beads, and carvings. It has little construction or industrial value.

Geological facts

Natural chrysocolla often shows blue, green, turquoise, and brown-black matrix patterns and may resemble turquoise. A uniform vivid blue color can indicate dyeing or stabilization.

Field identification & locations

Common localities include Arizona, Nevada, Chile, Peru, and the Democratic Republic of Congo. Check for copper-blue streak, softness, porous texture, and color concentration in cracks; a gemological test is needed for certainty.