| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| When lava cools quickly, it forms this type of volcanic glass that is usually black in color | obsidian | $800 | DJ | SCIENCE | 2026-02-23 | #9506 | |
| Though usually black, this volcanic glass is also found in red, brown, & mottled varieties | obsidian | $1,000 | DJ | SCIENCE | 1992-10-12 | #1861 |