mineral
Dzi Bead (Agate Bead)
Cryptocrystalline Quartz (SiO2) - Chalcedony/Agate
Hardness: 6.5-7 on Mohs scale; Color: Dark brown to black with etched white/tan circular eye patterns; Luster: Waxy to sub-vitreous; Structure: Microcrystalline, non-cleavage, conchoidal fracture
- Hardness
- 6
- Luster
- Waxy to sub-vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Dark brown to black with etched white/tan circular eye patterns; Luster: Waxy to sub-vitreous; Structure: Microcrystalline, non-cleavage, conchoidal fracture
Formation & geological history
Formed naturally as chalcedony silica deposition in volcanic cavity rocks, then historically artificially etched, carved, or treated with alkali and plant dyes by ancient Himalayan cultures (e.g., Tibet)
Uses & applications
Used in jewelry, amuletic talismans, religious artifacts, and as highly prized cultural collector items in Central and East Asia
Geological facts
Dzi beads (pronounced 'zee') are sacred stone beads from Tibet and the Himalayan region. Authentic ancient Dzi beads are prized as protective talismans and can command extraordinary prices, while modern reproductions are common
Field identification & locations
Identified by their characteristic cylindrical barrel shape with etched 'eye' patterns. Natural agate material shows conchoidal fracturing and micro-scratches under magnification. Commonly collected in Tibet, Nepal, India, and China
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