The clue "Glassy volcanic rock" last appeared in the The Times Concise crossword on June 18, 2020. The correct answer for this puzzle is "OBSIDIAN", a 8-letter word.
Solution OBSIDIAN is our most searched for solution by our visitors. Solution OBSIDIAN is 8 letters long. We have 0 further solutions of the same word length.
There are 2 solutions. The longest is PITCHSTONE with 10 letters, and the shortest is OBSIDIAN with 8 letters.
Indeed, the puzzle clue "GLASSY VOLCANIC ROCK" has seen a surge in lookups recently (last checked: 17 Dec 2025). Apparently it´s giving players some headaches!
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Solutions are between 8 and 10 letters long.