Hazenite
A hydrous potassium-sodium-magnesium phosphate of the struvite group, first described near California's Mono Lake.
Intro adapted from Wikipedia (CC BY-SA).
Hazenite is an IMA-recognized mineral species in the phosphate class, with the chemical formula KNaMg₂(PO₄)₂·14H₂O.
It crystallizes in the orthorhombic crystal system (space group Pnma).
Key properties: Mohs hardness 2–2.5; specific gravity 1.91; White streak; Vitreous luster; refractive index 1.274; optically biaxial.
IMA symbol Hz, IMA status: approved, named in 2007.
Found in and/or on completely dried-out or decomposed cyanobacteria on porous calcium carbonate (mainly calcite and aragonite) substrates or tufa in a hypersaline alkaline lake in a hydrologically closed basin.
It is found associated with Calcite, aragonite.
The mineral was named to honor Robert Miller Hazen, staff scientist at the Geophysical Laboratory, Carnegie Institution of Washington, D.C, USA, for his contributions to Earth sciences in general.