mineral
Tumbled blue-green stone, likely dyed agate
Agate (microcrystalline quartz, SiO₂); blue coloration may be artificial
AI-generated identification · may be incorrectLikely hardness 6.5–7 Mohs, glassy to waxy luster, cryptocrystalline quartz; the smooth, glossy surface and unusually vivid blue-green patches suggest tumbling and possible dye treatment. The image is insufficient to confirm the material or treatment.
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Physical properties
Likely hardness 6.5–7 Mohs, glassy to waxy luster, cryptocrystalline quartz; the smooth, glossy surface and unusually vivid blue-green patches suggest tumbling and possible dye treatment. The image is insufficient to confirm the material or treatment.
Formation & geological history
Agate forms as silica deposits in cavities, commonly in volcanic rocks, over geological time; dyeing and polishing occur after collection.
Uses & applications
Tumbled agate is sold as a pocket stone, craft material, or jewelry component; agate is also used for ornaments and small decorative objects.
Geological facts
Agate is a banded variety of chalcedony, though bands may not be visible in a small polished piece.
Field identification & locations
Look for translucency, curved bands, and hardness sufficient to scratch glass; vivid, concentrated color can indicate dye. Agate occurs worldwide, including Brazil, Uruguay, and the United States.
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