Nollmotzite , Quartz , Fluorite Locality: Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany Original description: Nollmotzite crystals with typical chisel-like terminations in quartz–fluorite gangue. Field of view ca 1.2 mm across. Photo by M. Noller. Image obtained from the type description: J. Plášil, A. R. Kampf, R. Škoda und J. Čejka (2018) Nollmotzite, Mg[UV(UVIO 2 ) 2 O 4 F 3 ]·4H 2 O, the first natural uranium oxide containing fluorine. Acta Crystallographica B74, 372–369. DOI:10.1107/S2052520618007321 . That paper is open-access, identical to the Creative Commons Attribution (CC-BY) Licence. — Photo: M. Noller (upload on mindat.org by Ronnie Van Dommelen ) · CC BY 3.0
Nollmotzite
Nollmotzite is an IMA-recognized mineral species in the halide class, with the chemical formula Mg[U⁵⁺(U⁶⁺O₂)₂O₄F₃]·4H₂O.
It crystallizes in the monoclinic crystal system (space group Cm).
Key properties: Vitreous luster; optically biaxial.
IMA symbol Nmz, IMA status: approved, named in 2018.
Formed by precipitation from U-containing aqueous solutions under partially reducing conditions most probably enhanced by consumption of oxygen during the oxidation of abundant pyrite present in the gangue.
It is found associated with Fluorite, barite.
The mineral was named to honor two German mineral collectors who found this new mineral. It combines the first four letters of their surnames: Markus Noller (b. 1977) and Reinhard Motzigemba (b.