Humberstonite
Eagle Borax Works Mine, Eagle Borax Spring, Inyo County, California, USA
White aggregates and possible microcrystals of humberstonite - one of three currently known sulfate-nitrate minerals and the only one combining Na, K, Mg, S and N. The mineral is likely associated with some other oxysalt species.
© Łukasz Kruszewski (2017)