ob·sid·i·an
noun/əbˈsɪdiən/
/əbˈsɪdiən/
[uncountable]- a type of dark rock that looks like glass and comes from volcanoes
黑曜岩；黑曜石 Word Originmid 17th cent.: from Latin obsidianus, error for obsianus, from Obsius, the name of the discoverer of a similar stone.