palagonite
noun
pa·lag·o·nite
pəˈlagəˌnīt
plural -s
: basaltic glass that is more or less altered and devitrified and that occurs with volcanic ash in the form of a basaltic tuff
palagonitic adjective
⸗¦⸗⸗¦nitik
Word History
Etymology
German palagonit, from Palagonia, Sicily + German -it -ite