Hazenite is a hydrous phosphate mineral with chemical formula of KNaMg2(PO4)2 · 14 H2O, therefore a hydrous alkali magnesium phosphate.
[4] It was first described for an occurrence adjacent to Mono Lake, California, and named after Robert M. Hazen of the Carnegie Institute.
It occurs as crystal clusters associated with decomposed cyanobacteria remnants on calcite or aragonite.
They dispose of the excess phosphorus by excreting hazenite crystals.
[6] The crystals disappear when it rains or the lake level rises.