Related Clues:

• Leucite source
• Volcanic buildup
• Surface magma
• Red-hot ooze
• Abrasive soap brand
• Outflow from 48-Across
• Material from a volcano
• Molten volcanic material
• Etna's outflow
• Lava, while underground
• Volcano stuff
• Flower made of rock?
• Etna's melted rock
• Molten igneous rock
• Hot flow