anhydrite

noun
an·​hy·​drite | \-ˌdrīt \

Definition of anhydrite 

: a mineral consisting of an anhydrous calcium sulfate that is usually massive and white or slightly colored

First Known Use of anhydrite

1805, in the meaning defined above

History and Etymology for anhydrite

German Anhydrit, from Greek anydros

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The first known use of anhydrite was in 1805

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Britannica.com: Encyclopedia article about anhydrite

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