boracite

noun

bo·​ra·​cite

ˈbōrəˌsīt,

ˈbȯr-

plural -s

: 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)

Word History

Etymology

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

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