mineral
Tumbled blue-green chalcedony (likely dyed agate or chrysoprase)
Microcrystalline quartz, SiO₂; chalcedony/agate variety
AI-generated identification · may be incorrectTranslucent blue-green, waxy to vitreous luster, with cloudy internal banding or inclusions and no visible cleavage. Hardness is about 6.5–7 Mohs; specific gravity is approximately 2.55–2.65.
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Physical properties
Translucent blue-green, waxy to vitreous luster, with cloudy internal banding or inclusions and no visible cleavage. Hardness is about 6.5–7 Mohs; specific gravity is approximately 2.55–2.65.
Formation & geological history
Chalcedony forms when silica-rich fluids fill cavities and fractures, commonly in volcanic rocks; agate develops concentric or irregular bands. The specimen is tumbled and may be dyed; its exact geological age cannot be determined from the image.
Uses & applications
Used for cabochons, beads, carvings, ornaments, and inexpensive jewelry; attractive translucent pieces are popular among collectors.
Geological facts
Blue-green color may indicate natural chrysoprase, copper-bearing chalcedony, or artificial dyeing. Dye commonly concentrates in cracks and produces unusually vivid, uniform coloration.
Field identification & locations
Identify by its glassy/waxy appearance, translucency, high hardness, and inability to scratch with a steel knife; it should scratch ordinary glass. Common sources include Brazil, Uruguay, Madagascar, Australia, and the United States.
