POL133JR Polyhedroid Agate Specimen

This polished Polyhedroid Agate specimen features alternating bands of quartz and banded agate in shades of blue and black. The edges have yellow moss or inclusions, and the center opens to a vug that goes through to the back of the agate. 10.8cm x 4.6cm polished surface, 4cm deep 6.7oz Polyhedroid Agates were found in Paraiba, Brazil, but are now unavailable. They are a pseudomorphic formation of agate, believed to have formed in the negative space between large crystals of calcite or aragonite. They uniquely feature naturally flat surfaces in a variety of angles.