Related Clues:

• It may be refined
• Galena or pyrite
• Seaman
• Bauxite or azurite
• Tin Man's need
• Stuff for surfacing
• Lubricant
• Metal source
• Roofer's gunk
• Refinery need
• Shale extract
• Feathers partner
• Cigarette residue
• Epitome of blackness
• Iron source