Related Clues:

• Beachgoer's aid
• Silver or iron, e.g.
• Energy source
• Deposit in some banks
• Miners dig it
• Rockhound's find
• Nickel in a pocket, perhaps?
• Quarry product
• Sesame product
• 'Mona Lisa,' for one
• Crude substance?
• Miner's load
• Deep matter?
• Vein filler
• Raw rock