mineral
Dyed blue chalcedony (likely dyed agate or quartzite)
Chalcedony, microcrystalline SiO₂; blue color likely artificial dye
AI-generated identification · may be incorrectHardness 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.
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Physical properties
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.
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.
