gemstone

Dyed agate (likely dyed chalcedony)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

AI-generated identification · may be incorrect

Smooth polished pebble with vivid magenta color, translucent edges, and waxy-to-glassy luster; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and cryptocrystalline structure. The intense uniform color strongly suggests dyeing rather than natural coloration.

Identified August 15, 2026More gemstone →

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Physical properties

Formation & geological history

Agate forms when silica-rich groundwater fills cavities in volcanic rock, depositing layered chalcedony over long geological timescales, commonly during the Cenozoic or older volcanic events. This specimen was likely cut, polished, and artificially dyed.

Uses & applications

Used as an inexpensive decorative stone, cabochon, bead, paperweight, or craft material; it has little industrial value in this form.

Geological facts

Agate is a variety of chalcedony distinguished by banding or other patterned color zones, though polished and dyed pieces may obscure natural structures.

Field identification & locations

Common sources include Brazil, Uruguay, India, Madagascar, and Mexico. Field identification includes hardness sufficient to scratch glass, lack of cleavage, waxy luster, and possible color concentration in cracks or pores; dye may fade or bleed under solvents.