Related Clues:

• Waste from coal-mining
• Glassy byproduct
• Byproduct of smelting
• Foundry detritus
• Foundry by-product
• Smeltery junk
• Bronze Age jewelry material
• Glasslike stuff in concrete
• Cinderlike lava
• Stony waste matter (in a heap?)
• Waste produced in the smelting or refining of ore
• Byproduct used in building
• Metallic residue
• Smelting junk
• Blacksmith's waste