mineral
Green Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
Hardness: 6.5-7 (Mohs scale); Color: Shades of green, teal, and milky white; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.58-2.64
- Hardness
- 6
- Color
- Shades of green, teal, and milky white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Shades of green, teal, and milky white; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.58-2.64
Formation & geological history
Formed in cavities within volcanic rocks (basalt or andesite) or metamorphic rocks. Silica-rich fluids precipitate in layers over long periods, creating the characteristic banding. Agates are common in Cenozoic era formations.
Uses & applications
Used primarily in jewelry, lapidary arts, spiritual/metaphysical collecting, and as decorative tumbled stones. Historically used for making mortars and pestles due to hardness.
Geological facts
The banding in agate is caused by rhythmic crystallization or variations in the impurities of the silica-rich solution. Most brightly colored green agates in the market are 'enhanced' or dyed to emphasize the banding.
Field identification & locations
Identify by its waxy luster, translucency, and distinctive curved 'fortification' banding. Often found in riverbeds or on beaches near volcanic deposits in locations like Brazil, India, and the USA.
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