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Nielsbohrite

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About NielsbohriteHide

Niels Bohr
Formula:
K(UO2)3(AsO4)(OH)4 · H2O
Colour:
yellow
Lustre:
Vitreous, Dull
Hardness:
2
Specific Gravity:
5.45 - 5.65
Crystal System:
Orthorhombic
Name:
After Niels Henrik David Bohr (1885-1962), Danish physicist. He contributed to understanding atomic structure and quantum mechanics. He received the Nobel Prize in Physics in 1922. Bohr mentored and collaborated with many of the top physicists of the century at his institute in Copenhagen. He was also part of the team of physicists working on the Manhattan Project.
This page provides mineralogical data about Nielsbohrite.


Classification of NielsbohriteHide

Approved
Approval Year:
2007
42.13.10.

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous

Physical Properties of NielsbohriteHide

Vitreous, Dull
Transparency:
Transparent
Colour:
yellow
Streak:
yellowish
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
5.45 - 5.65 g/cm3 (Measured)    

Optical Data of NielsbohriteHide

Type:
Biaxial (-)
RI values:
nα = 1.756(2) nβ = 1.764(2) nγ = 1.765(2)
2V:
Measured: 35° (5), Calculated: 39°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
strong r > v
Pleochroism:
Non-pleochroic

Chemical Properties of NielsbohriteHide

Formula:
K(UO2)3(AsO4)(OH)4 · H2O
IMA Formula:
(K,U,◻)(UO2)3(AsO4)(OH)4 · H2O

Crystallography of NielsbohriteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cccm
Setting:
Cccm
Cell Parameters:
a = 8.193(3) Å, b = 11.430(4) Å, c = 13.500(5) Å
Ratio:
a:b:c = 0.717 : 1 : 1.181
Unit Cell V:
1264.1 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.71 (80)
6.03 (100)
3.78 (70)
3.33 (80)
2.96 (60)
2.88 (40)
2.63 (50)
1.942 (50)

Type Occurrence of NielsbohriteHide

General Appearance of Type Material:
euhedral rhombohedron-like crystals to 0.15 mm in size, often altered
Place of Conservation of Type Material:
Staatliches Museum fur Naturkunde in Stuttgart, Germany, and the single crystal used for the structural study at the Laboratory of Mineralogy, University of Lie`ge, Belgium (no 20355).
Geological Setting of Type Material:
oxidized uranium deposit
Associated Minerals at Type Locality:

Synonyms of NielsbohriteHide

Fluorescence of NielsbohriteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for NielsbohriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K., Hatert, F., Theye, Th., Lissner, F., Roeller, K. (2009): Nielsbohrite, a new potassium uranyl arsenate from the uranium deposit of Menzenschwand in the Southern Black Forest, Germany. European Journal of Mineralogy, 21, 515-520.

Internet Links for NielsbohriteHide

Localities for NielsbohriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany (TL)
 
  • Baden-Württemberg
    • Black Forest
      • Menzenschwand
European J. Mineralogy 21,515-520(2009)
Mineral and/or Locality  
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