Tumbled Grey Agate / 20-40mm AVG - 1 PIECE

Quantity: 1 piece

Average size range: 20 to 40 millimeters

Agate is a banded variety of chalcedony that forms inside pockets of metamorphic and volcanic rock, with the initial layer that forms and the surrounding minerals and conditions affecting subsequent layers and giving agate its wide variation in appearance. This variety of agate contains inclusions of manganese oxide.