Extrusive Rock From Lava, Used in Bathrooms
This page is the CodyCross answer for the clue below from The 70's, Group 325, Puzzle 2 (David Bowie).
Question is: Extrusive Rock From Lava, Used in Bathrooms
and the answer is: PUMICE
Word Meaning:
PUMICE — A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into water or air as a froth containing masses of gas bubbles, which are frozen into the rock as the lava solidifies.
Definitions from Wiktionary.