sedimentary
Green Banded Agate
Cryptocrystalline microcrystalline Quartz (SiO2)
Hardness: 6.5-7 Mohs; Color: Banded green, white, and translucent; Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58–2.64.
- Hardness
- 6
- Color
- Banded green, white, and translucent
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Banded green, white, and translucent; Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58–2.64.
Formation & geological history
Formed in cavities within volcanic or sedimentary rocks where silica-rich groundwater deposited layers of chalcedony over long periods of time. This specific specimen is tumbled and likely dyed to enhance the green hue.
Uses & applications
Used primarily for decorative jewelry, tumbled stones for collectors, meditation stones, and metaphysical purposes.
Geological facts
Agate is named after the Achates River in Sicily where it was first discovered. While natural green agate exists, bright neon or intense greens are often achieved through artificial dyeing of translucent chalcedony.
Field identification & locations
Identify by its characteristic concentric or parallel banding and waxy surface. Native to Brazil, Uruguay, and India. Collectors should look for smoothness and clarity of bands.
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