lepidolite

noun
le·​pid·​o·​lite | \li-ˈpi-də-ˌlīt \

Definition of lepidolite 

: a variable form of mica used especially in glazes and enamels and as a source of lithium

First Known Use of lepidolite

circa 1796, in the meaning defined above

History and Etymology for lepidolite

German Lepidolith, from lepid- + -lith

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The first known use of lepidolite was circa 1796

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