Meitnerite
Meitnerite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (NH₄)(UO₂)(SO₄)(OH)·2H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Johannite structural group.
Key properties: Mohs hardness 2; specific gravity 3.32; Very pale yellow streak; Vitreous luster; optically biaxial.
IMA symbol Mne, IMA status: approved, named in 2017.
Occurs as efflorescent crusts on the surfaces of mine walls by oxidation in the humid underground environment of a Colorado Plateau type, roll-front uranium deposit in organic-rich former stream channel sediment.
It is found associated with Beshtauite, gypsum, quartz.
The mineral was named to honor Austrian-Swedish physicist Lise Meitner (1878-1968) who, with Otto Hahn and his assistant Fritz Straßmann.