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Glassy Black Igneous Rock

We've checked our database and believe the answer is OBSIDIAN which was last seen in the The Guardian Speedy crossword.
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We think the answer to this crossword clue is: OBSIDIAN

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LettersAnswerClue
99%8Exact Match!
noun

• acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces

41%9Igneous rock with a shiny, glassy appearance
noun

• a basic or basalt glass

41%8Igneous rock with a glassy texture
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The Guardian Speedy11 Feb 2007 Across 17
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