sedimentary

Green Moss Agate

Silicon Dioxide (SiO2) with Mineral Inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Pale to deep green with white or clear chalcedony; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Specific Gravity: 2.58-2.64

Hardness: 6
Color: Pale to deep green with white or clear chalcedony
Luster: Vitreous to waxy

Identified June 15, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Pale to deep green with white or clear chalcedony; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Specific Gravity: 2.58-2.64

Formation & geological history

Formed via the deposition of silica-rich groundwater in volcanic rock cavities. The green mossy colors are caused by filaments of manganese or iron oxides, as well as chlorite inclusions. Usually Cenozoic to recent in age.

Uses & applications

Primarily used for jewelry, lapidary carvings, decorative heart-shaped palm stones, and within the metaphysical or spiritual gemstone market.

Geological facts

Unlike its name suggests, Moss Agate does not contain organic moss; the pattern is purely mineral-based dendrites. It was traditionally known as the 'Gardener's Stone' for its association with nature.

Field identification & locations

Identified by its distinctive moss-like patterns inside semi-translucent chalcedony. Commonly found in India, Brazil, Uruguay, and the United States (specifically the Yellowstone River areas). Collectors look for high translucence and deep green filament density.