This Specimen has been sold.
6.7" Polished, Blue Agate Bowl - Madagascar
This is a beautiful, 6.7" wide, decorative bowl made from hand polished, blue and white agate. This agate specimen comes from Madagascar.
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.