hoernesite
noun
hoer·nes·ite
ˈhərnəˌsīt,
ˈhȯr-
plural -s
: a mineral Mg3As2O8.8H2O consisting of hydrous magnesium arsenate occurring as crystals resembling gypsum
Word History
Etymology
German hörnesit, from Moritz Hoernes †1868 Austrian paleontologist + German -it -ite