mineral
Dyed Blue Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5 to 7 on the Mohs scale. Color: Bright teal blue, vibrant turquoise blue, featuring fine concentric banding. Luster: Waxy to vitreous when polished. Crystal structure: Microcrystalline (trigonal). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58–2.64.
- Hardness
- 6
- Luster
- Waxy to vitreous when polished
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale. Color: Bright teal blue, vibrant turquoise blue, featuring fine concentric banding. Luster: Waxy to vitreous when polished. Crystal structure: Microcrystalline (trigonal). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58–2.64.
Formation & geological history
Agate forms secondary deposits in volcanic cavities or sedimentary rocks through the deposition of silica from hydrothermal fluids. This specific piece has been artificially dyed after tumbling to enhance its natural banding with a striking blue coloration.
Uses & applications
Widely used for ornamental carvings, jewelry, tumbled pocket stones, meditation aids, and decorative lapidary arts.
Geological facts
Agate is porous enough to absorb synthetic dyes easily, which is why bright neon blues, pinks, and purples are common in commercial lapidary trade. Naturally occurring blue agate, like Blue Lace Agate, is typically much softer in color.
Field identification & locations
Identified by its characteristic concentric color bands, smooth conchoidal fracture, and extreme hardness. Easily distinguished from natural minerals by its vivid, unnatural blue dye penetrating along porous growth layers. Found in major agate deposits in Brazil, Uruguay, and Madagascar.
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