mineral

Moss Agate (Crescent Moon Shape)

Silicon Dioxide (SiO2) with iron/manganese inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Brown, green, white, and translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Brown, green, white, and translucent
Luster: Vitreous to waxy

Identified July 25, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Brown, green, white, and translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).

Formation & geological history

Formed through volcanic activity where silica-rich groundwater deposited chalcedony along with iron or manganese oxides into rock cavities and vugs over millions of years.

Uses & applications

Popular for decorative carvings, lapidary art, crystal healing, and jewelry manufacturing.

Geological facts

Despite its name, moss agate does not contain organic plant material; its moss-like or tree-like patterns are formed by mineral impurities such as iron, chlorite, or manganese oxides.

Field identification & locations

Identified by its translucent chalcedony matrix filled with dendritic or web-like mineral inclusions and small quartz-lined cavities (druzy pockets). Commonly sourced from India, Brazil, and the USA.