This is a beautiful souvenir sheet, issued by Guinea-Bissau in 2008, displaying antique ruins and minerals. Included on the sheet are Sturmanite, Hematite, Celestine, Aegirine, Epidote, and Prehnite, among others. Also displayed on the sheet are the potato, Argentine Llama, and the Crested Eagle. The sheet is Post Office fresh, mint never hinged, F/VF.