mineral
Tumbled agate
Agate, a banded variety of microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectPolished, translucent honey-orange chalcedony with curved pale bands; vitreous to waxy luster, Mohs hardness 6.5–7, trigonal quartz structure, no cleavage. The small size and polish suggest a common tumbler stone.
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Physical properties
Polished, translucent honey-orange chalcedony with curved pale bands; vitreous to waxy luster, Mohs hardness 6.5–7, trigonal quartz structure, no cleavage. The small size and polish suggest a common tumbler stone.
Formation & geological history
Forms as silica-rich groundwater fills cavities, commonly in volcanic rocks, depositing successive layers of chalcedony. Agate deposits span many geological ages; the image cannot determine its specific source or age.
Uses & applications
Used in jewelry, ornaments, carvings, and lapidary collections; agate is also used for small decorative and precision objects.
Geological facts
Agate’s distinctive bands record changes in mineral-rich fluids during cavity filling; some stones may be dyed, though this specimen’s appearance alone does not establish treatment.
Field identification & locations
Look for translucent chalcedony and curved or concentric bands; common sources include Brazil, Uruguay, India, and the United States. Verify identity by hardness and close inspection of banding.
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