GLASSY BLACK IGNEOUS ROCK Crossword Clue

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Crossword Puzzle Infos
Obsidian is an 8-letter term for a glassy black igneous rock. It is formed when molten lava cools quickly, forming a natural glass. Obsidian is usually found near volcanoes and is composed of silicon dioxide. It is often used to make tools and weapons due to its hardness and sharp edges.
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