Abrasive Volcanic Stone Used for Polishing
This page is the CodyCross answer for the clue below from Mesopotamia, Group 969, Puzzle 1 (Sumerian Calendar).
Question
Abrasive Volcanic Stone Used for Polishing
Answer
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.