Glass Created When Volcanic Lava Cools
This page is the CodyCross answer for the clue below from Australia, Group 1004, Puzzle 2 (Aussie Meat Pie).
Question is: Glass Created When Volcanic Lava Cools
and the answer is: OBSIDIAN
Word Meaning:
OBSIDIAN — (mineralogy) A type of naturally occurring black glass produced by volcanoes.
Definitions from Wiktionary.