mineral

Tumbled blue-green chalcedony (likely dyed agate or chrysoprase)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

AI-generated identification · may be incorrect

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.

Identified August 26, 2026More mineral →

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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.