sedimentary
Green Moss Agate
Silicon Dioxide (SiO2) with Mineral Inclusions
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
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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.
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