What's light from Etna? Purplish-pink — in its interior, note (6)

I believe the answer is:

pumice

(Other definitions for pumice that I've seen before include "Volcanic-rock scourer" , "Mineral" , "Light porous stone used as polishing powder" , "Lava stone" , "Volcanic stone used as abrasive" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.