mineral

Moss Agate

SiO2

Hardness: 6.5-7 on the Mohs scale. Color: Clear to milky white with green, brown, or black inclusions resembling moss or ferns. Luster: Vitreous. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.

Hardness: 6
Luster: Vitreous

Identified June 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich fluids that percolate through voids in volcanic rocks or other environments. The 'moss' inclusions are typically composed of manganese oxide or iron oxide minerals.

Uses & applications

Commonly used in jewelry, particularly cut into cabochons for pendants and rings. Also used for ornamental carvings and as a collector's stone.

Geological facts

Despite its name, moss agate does not contain actual organic matter. The moss-like inclusions are entirely mineral.

Field identification & locations

Identify by the distinctive translucent to opaque white or gray background with dendritic, moss-like inclusions. Commonly found in India, Brazil, Uruguay, central Europe, and the western United States.