Related Clues:

• Copper or aluminum
• Lead, for one
• Rock genre, informally
• It may be precious
• Gold, silver or bronze
• Copper or nickel
• No-no in a microwave
• Heavy genre
• Copper, for one
• Tin or titanium
• Word with heavy or sheet
• Tin or tungsten
• Tin, for one
• Quonset hut material
• Element of change?