Mineral/Gemstone
Moss Agate
SiO2 with impurities (Chalcedony)
Hardness 6.5-7, Colorless or white with green, brown, or red dendritic inclusions, Vitreous luster, Microcrystalline structure, No cleavage, Specific gravity 2.58-2.64
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Physical properties
Hardness 6.5-7, Colorless or white with green, brown, or red dendritic inclusions, Vitreous luster, Microcrystalline structure, No cleavage, Specific gravity 2.58-2.64
Formation & geological history
Forms from silicon dioxide deposited from groundwater in the cavities of igneous rocks. The dendritic patterns are formed by oxides of iron or manganese.
Uses & applications
Used primarily in jewelry as a cabochon, and in ornamental carvings.
Geological facts
Moss agate is not a true form of agate, as it lacks concentric banding.
Field identification & locations
Identified by its distinctive moss-like or tree-like inclusions in a translucent to semi-translucent base. Common locations include India, Brazil, Uruguay, and the USA.
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