Check the listing for details. Brachiopod Pyritized 12 Piece Brachiopod Pyritized. Condition: Used. Listed at 200.00 USD. The product is a Brachiopod fossil that has been pyritized, meaning it has been replaced by iron pyrite. This process preserves the original shape and structure of the fossil, making it a unique and valuable collectible for enthusiasts of rocks, fossils, and minerals. The pyritization adds a metallic shine to the fossil, enhancing its aesthetic appeal and making it a desirable piece for collectors of Brachiopods. This set of 12 comes in the box seen. ** These boxes were given to my partner from her grandmother. An avid auction attender and obtained from a rock collector. Description is based off of the box labeling. Not confirmed by me as I am not a gemologist or geo specialist. **