bas·alt
noun/ˈbæsɔːlt/
/bəˈsɔːlt/
[uncountable]- a type of dark rock that comes from volcanoes
玄武岩（深色的火山岩） Word Originearly 17th cent. (in the Latin form): from Latin basaltes (variant of basanites), from Greek basanitēs, from basanos ‘touchstone’.