| Slag or dross that remains after a metal is smelted from its ore (6) |
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| What is dark-coloured cellular lava? (6) |
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| Is Cora searching for a piece of lava with steam-holes? |
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| Oscar & I swapped rocks (6) |
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| Slag from metal-smelting |
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| What dark-coloured hole-filled volcanic rock is used in drainage, landscaping? (6) |
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| Refined rock is lacking potassium - a smelter's waste (6) |
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| Reddish porous lava (6) |
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| Refuse left after smelting |
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| Basaltic lava ejected as fragments from a volcano (6) |
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| I have this scar - nothing else - from metal-smelting (6) |
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| Oscar and I look for lava with steam-holes (6) |
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| Smelting slag |
Premier Sunday |
08 Jul 2018 |
| Dark volcanic rock |
New York Times |
20 Apr 2016 |
| Turns up first class mythological birds - it's a release for Etna |
Irish Times Crosaire |
16 Jun 2015 |
| Smelting refuse |
Wall Street Journal |
22 May 2015 |
| Smelting refuse |
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| Slag |
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| Smelting refuse |
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| Slag |
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| Smelting residue |
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| Metal dross |
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| Foolhardy |
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| Smelting refuse |
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| Cellular lava |
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| Smelting residue |
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| Smelter slag |
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| Smelting refuse |
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| Slag |
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| Ore slag |
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| Dross |
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| Dross. |
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| Leftover of the smelting process. |
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| Cinders from a volcano. |
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| Slag. |
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| Metal refuse. |
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| Lava. |
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| Volcanic cinder. |
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| Slaggy lava. |
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| Refuse of a smeltery. |
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| Refuse from melting of metals. |
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| Dross; slag. |
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