Rock Identifier
Green Moss Agate (Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite) — mineral
mineral

Green Moss Agate

Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite

Hardness: 6.5-7 (Mohs scale); Color: Clear to milky white with moss-like green inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.64

Hardness
6
Color
Clear to milky white with moss-like green inclusions
Luster
Vitreous to waxy
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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Clear to milky white with moss-like green inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.64

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities of igneous rocks. The 'moss' patterns are caused by the presence of manganese or iron oxides/silicates during formation. Generally found in volcanic areas of various geological ages.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal collectors and metaphysical practices.

Geological facts

Despite its name, Moss Agate does not contain organic matter; the 'moss' is purely mineral. It has been known historically as the 'Gardener's Stone' and was used in ancient amulets to ensure a bountiful harvest.

Field identification & locations

Identify by its translucent body paired with dendritic, filament-like green inclusions. It is commonly found in India, Brazil, Uruguay, and the United States (specifically the Montana area). Collectors look for high translucency and high density of 'branching' patterns.

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