mineral
Dyed Agate Slice
Microcrystalline Quartz (SiO2) with artificial pigment
Hardness: 6.5-7.0 (Mohs scale). Color: Naturally translucent white/grey, artificially dyed bright blue. Luster: Vitreous to waxy. Structure: Cryptocrystalline. Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs scale). Color: Naturally translucent white/grey, artificially dyed bright blue. Luster: Vitreous to waxy. Structure: Cryptocrystalline. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed by the deposition of silica from groundwater in the cavities of igneous rocks such as basalt. This particular specimen has been sliced, polished, and artificially dyed to enhance its color.
Uses & applications
Decorative ornaments, coasters, jewelry making, wind chimes, and educational specimens.
Geological facts
The vibrant blue color of this slice is unnatural; agates are porous and easily take on dyes. Natural agates are typically brown, grey, white, or red.
Field identification & locations
Look for concentric banding or 'fortification' patterns. In the field, agates appear as dull, rough-textured nodules. Collectors identify dyed pieces by their 'hot' or 'electric' colors that don't occur in nature.
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