Mineral

Moss Agate

Silicon dioxide (SiO2) with inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7. Color: Clear or milky white base with green, branching inclusions. Luster: Vitreous. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.

Hardness: 6
Color: Clear or milky white base with green, branching inclusions
Luster: Vitreous

Identified June 18, 2026More mineral →

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Physical properties

Hardness: 6.5-7. Color: Clear or milky white base with green, branching inclusions. Luster: Vitreous. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.

Formation & geological history

Formed from silica-rich fluids filling cavities in volcanic rocks. The distinctive moss-like patterns are due to mineral impurities, typically manganese or iron oxides.

Uses & applications

Commonly used in jewelry, lapidary arts, and ornamental carvings. Also popular among collectors and crystal enthusiasts.

Geological facts

Despite its name, moss agate does not contain organic matter and is technically a chalcedony rather than a true banded agate.

Field identification & locations

Identified by its distinctive green, moss-like or dendritic inclusions within a translucent to milky white background. Common locations include India, Brazil, Uruguay, and the USA.