Green Banded Agate

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.

Identified on: 4/13/2026

Mode: Standard