Related Clues:

• Soap containing pumice
• Cotopaxi outflow
• Igneous-rock source
• Volcano's outflow
• Leucite source
• Surface magma
• Red-hot ooze
• Abrasive soap brand
• Outflow from 48-Across
• Material from a volcano
• Molten volcanic material
• Etna's outflow
• Volcano stuff
• Flower made of rock?
• Etna's melted rock