POL639pr Polyhedroid Agate Pair

This polished Polyhedroid Agate specimen pair shows a crystal with a center opening filled with banded white agate. Dimensions: 4.2cm x 1.7cm (2.2cm deep) 4.6cm x 1.8cm (2.6cm deep) Total weight: 1.7oz Polyhedroid Agates were found in Paraiba, Brazil, but are now unavailable. They are a unique formation of agate, featuring naturally flat surfaces at a variety of different angles. They are believed to have formed in the negative spaces between large crystal blades of calcite or aragonite, and can occasionally feature multiple "chambers" where those blades eroded and adjacent agates fused together.