Noun
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Obsidian is a stone formed by volcanic activity.
Stone tools made of obsidian were discovered from the ruins in this area.
Obsidian is a glassy volcanic rock with sharp fracture surfaces, so it has been used as a blade since ancient times.
Obsidian is known for its unique luster and deep coloration.
Geologists study the eruption history of volcanoes by analyzing the composition of obsidian.
Kanji that make up this word
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