Division; available at http://periodic.lanl.gov/images/periodictable.pdf.
Cover.Photographs showing examples of sources and uses of zirconium and hafnium. Upper left, cube and crystal bars of highly pure zirconium metal (greater than 99.95 percent purity). Upper right, a pure (99.98 percent) melted tip of a hafnium electrode used in an electron beam remelting furnace for manufacturing metal parts; an oxidized hafnium electron beam remelted ingot; and a cubic centimeter of hafnium metal. Photographs by Heinrich Pniok (http://pse-mendelejew.de). Lower left, primary igneous zircon grains separated from granite. Lower middle, detrital zircon grains separated from metamorphosed sandstone. Lower right, baddeleyite crystals from the Palabora carbonatite deposit, Limpopo Province, South Africa. Photographs by Rob Lavinsky (www.iRocks.com).