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datolite

noun dat·o·lite \ ˈdatᵊlˌīt \
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Definition of datolite

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

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Origin and Etymology of datolite

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

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