Possible Clues:

• Metallic element
• Metal element
• Hard metal element
• Corrosion-resistant metallic element discovered in Sweden in 1802
• Element important, aluminium? Find it in here
• Element with symbol Ta
• Metal worker in short story discovered pump
• So much for the French — a shapeless unfinished piece of metal
• Element found in brown powder after carbon's been extracted
• Hard metallic element