mineral

Green Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Hardness: 6.5–7 (Mohs); Color: Dark green with white or lighter green banding; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64

Hardness: 6
Color: Dark green with white or lighter green banding
Luster: Waxy to vitreous

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in volcanic and metamorphic environments as silica-rich groundwater fills cavities (vesicles) in lava or pockets in rock over millions of years. This specimen shows typical concentric banding formed by the rhythmic crystallization of silica.

Uses & applications

Commonly used in jewelry (beads, cabochons), metaphysical stones, ornamental carvings, and industrially for precision pendulums or mortars and pestles due to its hardness.

Geological facts

Natural green agate is relatively rare; many deep green specimens in the market are 'enhanced' or dyed chalcedony. It has been used for amulets since the Neolithic era and was highly valued in Ancient Egypt.

Field identification & locations

Identify by its waxy luster, translucency when held to light, and characteristic curved 'wavy' bands. Found globally in Brazil, India, Uruguay, and the US (Lake Superior region). Beginners should look for the conchoidal (shell-like) fracture patterns.

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