Rock Identifier
Tumbled blue-green chalcedony (likely dyed agate or chrysocolla-bearing chalcedony) (Microcrystalline quartz, SiO₂; blue coloration may reflect chrysocolla, copper minerals, or dye) — mineral
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 More mineral
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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.