carnallite

noun
car·nall·ite | \ ˈkär-nə-ˌlīt \

Definition of carnallite 

: a mineral consisting of hydrous potassium-magnesium chloride that is an important source of potassium

First Known Use of carnallite

1876, in the meaning defined above

History and Etymology for carnallite

German Carnallit, from Rudolf von Carnall †1874 German mining engineer

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The first known use of carnallite was in 1876

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