mineral

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)

Hardness: 6.5-7 (Mohs scale), Color: Clear to milky white base with green or brownish dendritic inclusions, Luster: Vitreous to waxy, Crystal structure: Trigonal/Hexagonal (Cryptocrystalline), Cleavage: None

Hardness: 6

Identified May 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the infiltration of mineral-rich water into fissures or volcanic rock cavities. The moss-like inclusions are typically manganese or iron oxides that have crystallized into dendritic patterns.

Uses & applications

Primarily used for lapidary items such as jewelry, cabochons, carved ornaments, and as a popular collector's stone due to its unique patterns.

Geological facts

Despite its name, it does not contain organic plant matter. The 'moss' is purely a chemical-geological formation. It has been used historically by various cultures as a stone of agriculture and good luck.

Field identification & locations

Identify by its translucent body combined with green branched filaments that look like plants. It is commonly found in India, Brazil, Uruguay, and the United States (specifically the Yellowstone River region).

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