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datolite

noun
dat·​o·​lite | \ ˈdatᵊlˌīt\
plural -s

Definition of datolite

: a mineral Ca2B5SiO9(OH)5 consisting of a basic calcium borosilicate commonly occurring in glassy greenish crystals

History and Etymology for datolite

German datolith, from Greek dateisthai to divide + German -lith; from its granular structure

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