mineral
Swirled Agate Bead
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Gray, white, and translucent blue-gray swirls; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Gray, white, and translucent blue-gray swirls
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Gray, white, and translucent blue-gray swirls; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.64
Formation & geological history
Formed in volcanic rock cavities or sedimentary rocks through groundwater silica deposition. Agates can be millions of years old, often dating to the Tertiary or Cretaceous periods.
Uses & applications
Primarily used in jewelry making, beadwork, decorative arts, and as a pocket stone for collectors.
Geological facts
This specimen is a manufactured spherical bead made from natural agate. The swirling patterns are characteristic of chalcedony varieties, where different layers of silica impurities create banding.
Field identification & locations
Identify by its waxy luster, conchoidal fracture (if chipped), and high hardness which prevents scratching by steel. Agates are common in Brazil, Uruguay, and the United States.
