mineral

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with inclusions

Hardness: 6.5-7 (Mohs scale); Color: Cream, tan, brown, and green with dendritic inclusions; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None

Hardness: 6
Color: Cream, tan, brown, and green with dendritic inclusions
Luster: Waxy to vitreous

Identified April 4, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Cream, tan, brown, and green with dendritic inclusions; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None

Formation & geological history

Formed through the deposition of silica in volcanic rock cavities or sedimentary veins. The characteristic 'moss' patterns are caused by manganese or iron oxide inclusions. Found in various geological ages from Precambrian to recent.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons), pocket stones, and decorative carvings like the tree shape shown.

Geological facts

Despite its name, it does not contain organic matter; the 'moss' is actually mineral dendrites. It is historically known as a 'gardener's stone' believed to help crops grow.

Field identification & locations

Identify by its translucent body combined with dark, branch-like or moss-like inclusions. Commonly found in India, Brazil, and the USA (Montana/Oregon). Collectors look for high translucency and distinct dendritic patterns.

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