Mineral

Moss Agate

Silicon dioxide (SiO2) with mineral inclusions

Hardness: 6.5-7 on Mohs scale. Color: Clear or milky white with green, brown, or red inclusions resembling moss or vegetation. Luster: Vitreous. Crystal structure: Cryptocrystalline (chalcedony). 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 filling cavities or cracks in volcanic rocks over millions of years. The moss-like inclusions are typically formed by oxides of manganese or iron.

Uses & applications

Used primarily in jewelry, ornamental carvings, and as a collector's stone. Historically used for talismans and amulets.

Geological facts

Despite its name, moss agate does not contain organic matter. The fern-like patterns are dendritic inclusions. It is sometimes referred to as 'Mocha stone' if it comes from the Arabian city of Mocha.

Field identification & locations

Identifiable by its translucent to semi-translucent base with distinct, dendritic, moss-like inclusions. Commonly found in India, Brazil, Uruguay, central Europe, and the USA. Collectors look for distinct, artistic patterns.

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