2.1" Polished Dendritic Agate Sphere - Madagascar

This is white agate from Madagascar which has been hand-polished from its original rough/natural state, into a sphere. There are small black/brown dendritic formations throughout the agate.

Comes with the pictured display stand.

Agate is a variety of microcrystalline quartz (chalcedony) that displays translucence and in some cases banding. Agate primarily forms when silica-rich fluids fill pockets within rock and/or fossils, resulting in deposition of the silica along the walls of the rock. This process can result in banding patterns as the composition and impurities of the fluids change over time. These banding patterns can either form as flat layers or rounded layers, depending on the surfaces available for deposition.

Dendrites that occur within rock are most often a result of intruding (percolating) mineral solutions that contained manganese and/or iron. These solutions can work their way through microscopic cracks in the rock, leaving behind a branching pattern throughout the rock. By an untrained eye, these can be mistaken for plant fossils within the rock.
Chalcedony var. Agate
2.1" in diameter