gemstone

Moss Agate

Silicon Dioxide (Chalcedony variety) with green hornblende or chlorite inclusions - SiO2

AI-generated identification · may be incorrect

Hardness of 6.5 to 7 on the Mohs scale, colors ranging from white and clear to deep green, vitreous to waxy luster, microcrystalline (cryptocrystalline) crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.64.

Identified July 30, 2026More gemstone →

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Physical properties

Formation & geological history

Formed from weathering and alteration of volcanic or igneous rocks where silica-rich groundwater fills cavities and fissures, precipitating microscopic quartz crystals along with trapped mineral impurities.

Uses & applications

Popularly used for cabochons, beads, ornamental carvings, lapidary art, and metaphysical collection.

Geological facts

Despite its name, moss agate does not contain organic matter; the green inclusions are mineral dendrites resembling moss or plant growth.

Field identification & locations

Can be identified by its translucent to milky chalcedony base and distinctive moss-like or dendritic green inclusions. Commonly found in India, the United States, Australia, and Brazil.