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
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Merriam-Webster unabridged
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