mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Hornblende inclusions
Hardness: 6.5-7 (Mohs scale); Color: Clear to milky white with green, dendritic (plant-like) inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Cryptocrystalline)
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Clear to milky white with green, dendritic (plant-like) inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Cryptocrystalline)
Formation & geological history
Forms through the deposition of silica in fissures or cavities of volcanic rocks. The 'moss' patterns are caused by filamentous inclusions of minerals like manganese or iron oxides, often found in Cenozoic era volcanic deposits.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's stone.
Geological facts
Despite its name, moss agate does not contain organic matter; the green patterns are strictly mineral-based. It has been used historically as a talisman for gardeners and agricultural wealth.
Field identification & locations
Identify by its translucent body combined with dark green branching patterns. Look for it in riverbeds or gravel deposits in volcanic regions like India, Brazil, and the western United States.
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