mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale; Color: Translucent to opaque white/clear with green hornblende, chlorite, or iron inclusions creating moss-like patterns; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz); Specific gravity: 2.58-2.64.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Translucent to opaque white/clear with green hornblende, chlorite, or iron inclusions creating moss-like patterns; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz); Specific gravity: 2.58-2.64.
Formation & geological history
Formed within volcanic rock cavities (geodes) or weathered limestone through hydrothermal deposition of silica-rich solutions containing manganese and iron oxides.
Uses & applications
Used extensively in jewelry (cabochons, beads, rings), lapidary arts, decorative carvings, and as a popular tumbled stone for rock collectors.
Geological facts
Despite its name, moss agate does not contain any organic moss or plant material. The intricate green, black, or brown branch-like patterns inside are dendrites formed by mineral impurities like chlorite or iron oxides.
Field identification & locations
Identified by its distinctive green, forest-like or mossy inclusions floating within translucent chalcedony quartz. Commonly found in India, Brazil, Uruguay, Russia, and parts of the United States like Montana.
