Nielsbohrite from Krunkelbach Valley Uranium deposit, Menzenschwand, St Blasien, Baden-Württemberg, Germany. Field of view 2-3 mm. — Photo: Leon Hupperichs · CC BY-SA 3.0
Nielsbohrite
Nielsbohrite is an IMA-recognized mineral species in the arsenate class, with the chemical formula (K,U, )(UO₂)₃(AsO₄)(OH)₄·H₂O.
It crystallizes in the orthorhombic crystal system (space group Cccm).
Key properties: Mohs hardness 2; specific gravity 5.45; Yellow streak; Vitreous to dull luster; optically biaxial.
IMA symbol Nbr, IMA status: approved, named in 2002.
A secondary mineral formed near oxidizing uraninite.
It is found associated with Hematite, pyrite, schoepite, metazeunerite.
The mineral was named to honor Niels Hendrik David Bohr (1885-1962), Danish physicist.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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