boracite

noun
bo·ra·cite | \ˈbōrəˌsīt, ˈbȯr-\
plural -s

Definition of boracite 

: a mineral Mg3B7O13Cl consisting of a borate and chloride of magnesium that is strongly pyroelectric and occurs in hard glassy crystals and in softer white masses (hardness 7, specific gravity 2.9)

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History and Etymology for boracite

German borazit, from Medieval Latin borac-, borax + German -it -ite

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