sarmientite
noun
sar·mi·en·tite
ˌsärmēˈent‧ˌīt,
-n‧ˌtīt
plural -s
: a mineral Fe2(AsO4)(SO4)(OH).5H2O consisting of a hydrous basic arsenate and sulfate of iron
Word History
Etymology
Spanish sarmientita, from Sarmiento, town in Argentina + Spanish -ita -ite