hydroboracite

noun
hy·​dro·​boracite

Definition of hydroboracite 

: a mineral CaMgB6O11.6H2O consisting of a white hydrous calcium magnesium borate and occurring in fibrous and foliated masses

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History and Etymology for hydroboracite

obsolete German hydroboracit (now hydroborazit), from German hydr- + Medieval Latin borac-, borax borax + German -it -ite

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