mineral

Dyed blue chalcedony (likely dyed agate or quartzite)

Chalcedony, microcrystalline SiO₂; blue color likely artificial dye

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; vivid turquoise-blue color, waxy to vitreous luster, cryptocrystalline quartz structure, no visible cleavage, and typical specific gravity near 2.6. The smooth rounded form indicates tumbling or polishing.

Identified August 30, 2026More mineral →

Explore Dyed blue chalcedony (likely dyed agate or quartzite) in the encyclopedia →

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Physical properties

Formation & geological history

Chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; deposits range from Paleozoic to Cenozoic. The intense uniform blue is probably introduced after cutting by dye treatment, rather than natural coloration.

Uses & applications

Used as a decorative tumbled stone, cabochon, ornamental object, and inexpensive jewelry material; it has little industrial use beyond silica applications.

Geological facts

Natural blue chalcedony is generally paler and rarer; dye may concentrate in pores, fractures, or surface pits. It can resemble dyed howlite, magnesite, or glass.

Field identification & locations

Check for dye pooling in cracks, white interiors beneath scratches, and quartz-like hardness: it should scratch ordinary glass but not be scratched by steel. Common chalcedony sources include Brazil, Uruguay, India, Madagascar, and Turkey.