datolite

noun

dat·​o·​lite

ˈdatᵊlˌīt

plural -s

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

Word History

Etymology

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

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