mineral
Banded Agate (Dyed)
SiO2 (Silicon Dioxide / Microcrystalline Quartz)
Hardness: 6.5-7 on Mohs scale; Color: Grayish, translucent with magenta/pink dyed band and reddish inclusions; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Conchoidal fracture.
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Grayish, translucent with magenta/pink dyed band and reddish inclusions; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Conchoidal fracture.
Formation & geological history
Agate forms within cavities of volcanic or metamorphic rocks through the deposition of silica from groundwater in concentric layers. This specimen has been artificially dyed in sections to enhance pink tones.
Uses & applications
Popular for lapidary work, jewelry making, tumbled pocket stones, decorative display specimens, and gemstone collections.
Geological facts
Agate is a variety of chalcedony. Many commercial tumbled agates undergo dye processes using iron, chromium, or organic dyes because agate is porous and easily absorbs pigments along specific growth bands.
Field identification & locations
Identified by concentric or parallel banding pattern, smooth waxy feel, translucency, and Mohs hardness around 7. Common in Brazil, Uruguay, Madagascar, and the US (e.g., Lake Superior).
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