Dendritic Agate

Dendritic Agate is a whitish-gray or colourless chalcedony with tree or fern-like markings known as dendrites. The varietal name Agate is used for this gem even though it does not exhibit the banding that is typical of agate. The dendrites in Dendritic Agate are iron or manganese inclusions and are usually brown or black in colour. Though they appear organic due to their fern-like structure, they are actually inorganic, traces of iron or manganese from neighbouring rock that crystallize after seeping through fine surface fractures in the agate. Dendritic Agate has a hardness of 6.5 to 7 on the Mohs scale.