Related Clues:

• Rock used in walls
• Countertop material
• Mount Rushmore rock
• 'The ___ City' (nickname of Aberdeen)
• Hard stone from Tangier
• Hard igneous rock
• Hard rock from Tangier
• Hard, igneous rock
• A very hard rock from Tangier
• Very hard rock from Tangier
• Put Ulster in the fireplace to make one bolder, by the sound of it
• It's hard for one of the older generation to tie this in a knot
• If one managed it inside it might make one bolder, by the sound of it
• It's hard to find a fire there around Ulster
• Managed it inside the rock