出典:Wiktionary
出典:『Wiktionary』 (2026/05/05 03:12 UTC 版)
From Latin obsidianus; named after Obsidius, who was, according to Pliny, the Roman who discovered the stone in Aethiopia.
obsidian (usually uncountable, plural obsidians)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/14 14:03 UTC 版)
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.
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