duplexite

noun
du·​plex·​ite | \ˈd(y)üˌplekˌsīt\
plural -s

Definition of duplexite 

: a mineral perhaps Be4Ca6Al2Si14O41.2H2O consisting of hydrous beryllium calcium aluminosilicate

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History and Etymology for duplexite

S. Duplex, 20th century Australian quarry manager who found it + English -ite

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