obsidian

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# 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
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