mineral

Tumbled blue-green chalcedony (likely dyed agate or chrysocolla-bearing chalcedony)

Microcrystalline quartz, SiO₂; blue coloration may reflect chrysocolla, copper minerals, or dye

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; translucent blue-green body with cloudy white veining, waxy-to-glassy luster, and no visible cleavage. The smooth shape indicates machine tumbling and polishing.

Identified August 20, 2026More mineral →

Explore Tumbled blue-green chalcedony (likely dyed agate or chrysocolla-bearing chalcedony) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Tumbled blue-green chalcedony (likely dyed agate or chrysocolla-bearing chalcedony)
Scientific name: Microcrystalline quartz, SiO₂; blue coloration may reflect chrysocolla, copper minerals, or dye
Category: mineral
Identified: August 20, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common tumbled piece; $30–$100+ if confirmed natural, unusually translucent, or chrysocolla-rich.

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

Hardness about 6.5–7 Mohs; translucent blue-green body with cloudy white veining, waxy-to-glassy luster, and no visible cleavage. The smooth shape indicates machine tumbling and polishing.

Formation & geological history

Chalcedony forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, commonly during the Cenozoic and older hydrothermal episodes; coloration depends on trace copper minerals or treatment.

Uses & applications

Used as a decorative stone, cabochon, carving material, and inexpensive jewelry or collectible specimen; polished pieces are often sold as worry stones.

Geological facts

The vivid, fairly uniform blue color and surface pattern commonly indicate dye treatment, though natural blue chalcedony and chrysocolla-bearing varieties also occur.

Field identification & locations

Identify by its waxy luster, conchoidal fracture, translucency, and quartz-like hardness; a scratch test and acetone swab can help detect imitations or dye, but may damage the polish. Common sources include Brazil, Madagascar, Indonesia, and the western United States.