hoernesite

noun
hoer·​nes·​ite | \ˈhərnəˌsīt, ˈhȯr-\
plural -s

Definition of hoernesite 

: a mineral Mg3As2O8.8H2O consisting of hydrous magnesium arsenate occurring as crystals resembling gypsum

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History and Etymology for hoernesite

German hörnesit, from Moritz Hoernes †1868 Austrian paleontologist + German -it -ite

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