This is a beautiful sheet of 5 stamps, issued by Comoros in 2011, displaying minerals. Featured minerals shown include Pyrite, Pyromorphite, Elbaite Tourmaline, Sphalerite, Forsterite, Peridot, Inesite, Malachite, Cerussite, Dolomite, Hematite, Fluorite, and Calcite. The sheet is Michel catalog #2929-33, and is Post Office fresh, mint never hinged, and F/VF.