This is a beautiful stamp souvenir sheet, issued by Comoros in 2011, displaying minerals. Featured minerals shown include Fluorite, Aragonite, Rhodochrosite, Quartz, Pyrrhotite, Calcite, Hematite, Malachite, Microcline, Albite, Beryl, and Aquamarine. The sheet is Michel catalog #2949/Bl.611, and is Post Office fresh, mint never hinged, and F/VF.