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IMA 2010-076 = heisenbergite

Posted by Marco E. Ciriotti  
Marco E. Ciriotti April 26, 2012 10:32AM
▪ Walenta, K. & Theye, T. (2012): Heisenbergite, a new uranium mineral from the uranium deposit of Menzenschwand in the Southern Black Forest, Germany. Neues Jahrbuch für Mineralogie - Abhandlungen, 189, 117-123.

Heisenbergite is the seventh new uranium mineral first described from the uranium deposit of Menzenschwand in the Southern Black Forest, Baden Württemberg, Germany. It occurs there as a rare secondary mineral associated with quartz, baryte, uraninite, billietite, studtite, rutherfordine, joliotite, goethite and hematite. Its occurrence is not restricted to Menzenschwand, but it was also found at El Sherana, South-Alligator-River-District in the Northern Territory of Australia from where it was described as an unnamed uranium oxide by Threadgold (1960). A further occurrence is Joachimsthal in the Czech Republic reported by Ondruš et al. (1997). The mineral and its name were approved by the CNMNC in January 2011 (IMA No. 2010-076).
At Menzenschwand it forms, besides anhedral particles, long prismatic crystals up to about 15 μm in length but only a few μm in thickness. The colour varies somewhat: yellow, yellow brown or orange brown. The streak is yellow, the lustre vitreous. Further properties are: opaque to translucent, particles in liquids transparent, not fluorescent, cleavage and parting not observed, fracture irregular. Hardness (Mohs) about 2, density (calc.) 5.14 g/cm3. Refractive indices: nα 1.733(3), nγ 1.800(5), nβ close to nγ, optical character (-). Extinction straight with l (= Z) positive. As no single crystal studies were possible due to the small size of the crystals, the dimensions of an orthorhombic unit cell were derived from the indexed powder data: a 13.10(1) Å, b 13.76(1), c 14.50(1), V 2613,7(2) Å3, Z = 24. Posssible space groups: P212121, Pna21, Pnma. Strongest lines of the powder pattern: 7.92 Å (10) 111; 7.25 (9) 002; 3.57(7) 321; 3.27 (9) 322, 400. Chemical composition determined by electron microprobe (wt.%): UO3 88.58, PbO 1.31, BaO 0.17, CaO 0.13, H2O (by difference) 9.81, total 100.00 %, being similar to the composition of schoepite UO3 · 2.25H2O, metaschoepite UO3 · 2H2O, and paulscherrerite UO2(OH)2. The empirical formula based on 5 oxygen atoms is U1.044Pb0.020Ba0.004Ca0.008H3.672O5, simplified UO2(OH)2 · H2O, or UO3 · 2H2 O. The mineral is easily soluble in HCl 1:1 and HNO3 1:1. On the basis of Raman spectral data it is suggested that two distinct type of coordination polyhedra for uranium are present in the heisenbergite structure.
Robert Simonoff April 26, 2012 02:40PM
Certainly named after Werner Heisenberg, right?

Marco E. Ciriotti April 26, 2012 03:55PM
Yes. Werner Karl Heisenberg: the Nobel Prize in Physics 1932 who made important contributions to quantum mechanics.
Jolyon & Katya Ralph April 26, 2012 04:13PM
Ah yes, the man who tried to build the Nazi atomic bomb.

After the war he claimed he tried to sabotage these efforts by deliberately over-estimating the amount of fissile material needed for a chain reaction, however it may be that he simply miscalculated.

Ronald John Gyllenhammer April 26, 2012 05:09PM
> "...however it may be that he simply miscalculated."

On this point, there will forever remain some "uncertainty". :-)
Knut Edvard Larsen June 09, 2012 02:51PM
Heisenbergite & data entered in database.
Knut Edvard Larsen June 09, 2012 02:54PM
A question about the TL:
Is "the uranium deposit of Menzenschwand" identical with Krunkelbach Valley Uranium deposit ?

Edited 1 time(s). Last edit at 06/09/2012 02:55PM by Knut Edvard Larsen.
Uwe Kolitsch June 09, 2012 04:19PM
Peter Haas June 09, 2012 04:31PM
"Werner Karl Heisenberg: the Nobel Prize in Physics 1932 who made important contributions to quantum mechanics."

(1) His surname is spelled "Carl"
(2) He made far more than just important contributions. Contributing to something implies that this "something" already exists, but it didn't at that time. The work of Heisenberg formed the basis of modern quantum mechanics.
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