Reference: ▪ 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. Abstract: 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. http://www.mindat.org/forum.php?read,14,259169,259169#msg-259169 Tue, 21 May 2013 08:46:15 +0000 Phorum 5.2.15a http://www.mindat.org/forum.php?read,14,259169,263142#msg-263142 http://www.mindat.org/forum.php?read,14,259169,263142#msg-263142
(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.]]> Peter Haas IMA Status Sat, 09 Jun 2012 16:31:36 +0000 http://www.mindat.org/forum.php?read,14,259169,263140#msg-263140 http://www.mindat.org/forum.php?read,14,259169,263140#msg-263140 Uwe Kolitsch IMA Status Sat, 09 Jun 2012 16:19:17 +0000 http://www.mindat.org/forum.php?read,14,259169,263125#msg-263125 http://www.mindat.org/forum.php?read,14,259169,263125#msg-263125 Is "the uranium deposit of Menzenschwand" identical with Krunkelbach Valley Uranium deposit [www.mindat.org] ?]]> Knut Edvard Larsen IMA Status Sat, 09 Jun 2012 14:54:29 +0000 http://www.mindat.org/forum.php?read,14,259169,263124#msg-263124 http://www.mindat.org/forum.php?read,14,259169,263124#msg-263124 Knut Edvard Larsen IMA Status Sat, 09 Jun 2012 14:51:12 +0000 http://www.mindat.org/forum.php?read,14,259169,259220#msg-259220 http://www.mindat.org/forum.php?read,14,259169,259220#msg-259220
On this point, there will forever remain some "uncertainty". :-)]]> Ronald John Gyllenhammer IMA Status Thu, 26 Apr 2012 17:09:14 +0000 http://www.mindat.org/forum.php?read,14,259169,259213#msg-259213 http://www.mindat.org/forum.php?read,14,259169,259213#msg-259213
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.

Jolyon]]> Jolyon & Katya Ralph IMA Status Thu, 26 Apr 2012 16:13:04 +0000 http://www.mindat.org/forum.php?read,14,259169,259209#msg-259209 http://www.mindat.org/forum.php?read,14,259169,259209#msg-259209 Marco E. Ciriotti IMA Status Thu, 26 Apr 2012 15:55:56 +0000 http://www.mindat.org/forum.php?read,14,259169,259203#msg-259203 http://www.mindat.org/forum.php?read,14,259169,259203#msg-259203
Bob]]> Jessica and Robert Simonoff IMA Status Thu, 26 Apr 2012 14:40:48 +0000 http://www.mindat.org/forum.php?read,14,259169,259169#msg-259169 http://www.mindat.org/forum.php?read,14,259169,259169#msg-259169 ▪ 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.

Abstract:
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.]]> Marco E. Ciriotti IMA Status Thu, 26 Apr 2012 10:32:33 +0000