mineral
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions of hornblende or chlorite
Hardness: 6.5-7 (Mohs scale), Color: Clear/milky with green dendritic inclusions, Luster: Vitreous, Structure: Hexagonal (Trigonal), Cleavage: None (Conchoidal fracture)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Clear/milky with green dendritic inclusions, Luster: Vitreous, Structure: Hexagonal (Trigonal), Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed in volcanic rocks where silica-rich groundwater fills cavities, with mineral impurities (manganese or iron) blooming into moss-like patterns during formation.
Uses & applications
Used primarily in jewelry (cabochons), ornamental housewares, gardening stones, and as a popular semi-precious stone for collectors.
Geological facts
Despite the name, moss agate is not organic; it contains no moss. The patterns are purely mineral growth called dendrites, suggesting botanical life through a quirk of chemistry.
Field identification & locations
Identify by holding to light to see translucent quartz with dark green 'filaments' inside. Found commonly in India, Brazil, and the USA (Montana/Washington).
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