mineral

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxide

Hardness: 6.5–7 (Mohs scale); Color: Clear or milky white with green, dendritic inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58–2.64

Hardness: 6
Color: Clear or milky white with green, dendritic inclusions
Luster: Vitreous to waxy

Identified April 2, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica in fissures of igneous rocks or volcanic vesicles. The 'moss' patterns are caused by mineral impurities (like hornblende or chlorite) rather than organic matter. Found in areas with volcanic history.

Uses & applications

Predominantly used as a gemstone for jewelry, ornamental carvings, and as a popular healing stone in metaphysical practices.

Geological facts

Despite its name, it does not contain organic moss. It belongs to the chalcedony family, which is a cryptocrystalline variety of quartz. It was historically favored as a 'gardener's stone' for its symbolic connection to nature.

Field identification & locations

Identify in the field by looking for translucent or white quartz/chalcedony with deep green dendritic (branching) patterns. Commonly found in India, Brazil, Uruguay, and the United States (Montana/Oregon).

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