sedimentary

Green Moss Agate / Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions

Hardness: 6.5–7 on Mohs scale; Color: Translucent to opaque green with reddish-brown earthy inclusions; Luster: Vitreous to waxy; Structure: Cryptocrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.64

Hardness: 6
Luster: Vitreous to waxy

Identified March 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater into the cavities of igneous rocks (basalt) or sedimentary layers. The 'moss' or 'filigreed' appearance comes from the presence of oxides of manganese or iron that crystallized during the silica's cooling phase.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for lapidary enthusiasts due to its unique patterns.

Geological facts

Despite its name, Moss Agate contains no organic moss; the patterns are strictly mineral. In ancient times, it was considered a stone of agriculture and was believed to help crops grow.

Field identification & locations

Identify in the field by its waxy luster, conchoidal (shell-like) fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds or volcanic regions in India, Brazil, and the Western United States (MT, WY).

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