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A polished Polyhedroid Agate specimen featuring very dark blue to black and muted yellow banded agate with an open vug in the center. This piece is polished at two angles, and is slightly UV reactive.
Dimensions:
9.4cm x 1.6cm (4.7cm deep)
Weight: 1.9oz
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.