gemstone
Dyed Agate
Cryptocrystalline variety of Silica (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Naturally translucent gray/brown, here dyed pink, purple, and magenta; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Naturally translucent gray/brown, here dyed pink, purple, and magenta; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Primary formation occurs in volcanic rocks (lavas) where silica-rich groundwater fills gas cavities (vesicles). These specimens are tumbled, sliced, and artificially dyed to enhance color.
Uses & applications
Commonly used in jewelry (beads, pendants), decorative ornaments, bookends, and collection pieces for beginners.
Geological facts
Agate was first discovered along the Achates River in Sicily. It is unique among minerals for its beautiful concentric banding, which is caused by rhythmic crystallization layers.
Field identification & locations
Identify by characteristic banding and waxy texture. In jewelry, bright unnatural colors (like neon pink or deep purple) on banded stones are a definitive sign of industrial dyeing.
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