roesslerite

noun
roess·​ler·​ite | \ˈresləˌrīt, ˈrə(r)s-\
plural -s

Definition of roesslerite 

: a mineral MgH(AsO4)·7H2O consisting of a hydrous acid arsenate of magnesium

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First Known Use of roesslerite

1862, in the meaning defined above

History and Etymology for roesslerite

German rösslerit, from Karl Rössler, 19th century resident of Hanau, Germany + German -it -ite

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The first known use of roesslerite was in 1862

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