Classification of Nielsbohrite |
| IMA status: | Approved 2007 |
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| Dana 8th edition ID: | 42.13.10.
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous |
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| mindat.org URL: | http://www.mindat.org/min-32208.html
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Type Occurrence of Nielsbohrite |
| Type Locality: | Krunkelbach Valley Uranium deposit, Menzenschwand, Black Forest, Baden-Württemberg, Germany |
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| General Appearance of Type Material: | euhedral rhombohedron-like crystals to 0.15 mm in size, often altered |
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| Associated Minerals at type locality: | |
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Physical Properties of Nielsbohrite |
| Lustre: | Vitreous, Dull |
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| Colour: | yellow |
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| Streak: | yellowish |
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| Hardness (Mohs): | 2 |
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| Cleavage: | None Observed |
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| Fracture: | Irregular/Uneven |
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| Density (measured): | 5.45 - 5.65 g/cm3 |
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Crystallography of Nielsbohrite |
| Crystal System: | Orthorhombic |
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| Class (H-M): | mmm (2/m 2/m 2/m) - Dipyramidal |
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| Space Group: | Cccm {C2/c 2/c 2/m} |
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| Cell Parameters: | a = 8.193(3) Å, b = 11.430(4) Å, c = 13.500(5) Å
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| Ratio: | a:b:c = 0.717 : 1 : 1.181 |
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| Unit Cell Volume: | V 1264.1 ų |
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| Z: | 4 |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 6.71 | | (80) | | 6.03 | | (100) | | 3.78 | | (70) | | 3.33 | | (80) | | 2.96 | | (60) | | 2.88 | | (40) | | 2.63 | | (50) |
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Optical Data of Nielsbohrite |
| Type: | Biaxial (-) |
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| RI values: | nα = 1.756(2) nβ = 1.764(2) nγ = 1.765(2) |
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| 2V: | Measured: 35° (5), Calculated: 39° |
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| Maximum Birefringence: | δ = 0.009
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | High |
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Chemical Properties of Nielsbohrite |
| Formula: | |
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| All elements listed in formula: | As, H, K, O, U |
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Other Names for Nielsbohrite |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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References for Nielsbohrite |
| Reference List: | 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.
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Internet Links for Nielsbohrite |
| Search Engines: |
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| External Links: | Look for Nielsbohrite on WebmineralLook for Nielsbohrite on Athena MineralogyLook for Nielsbohrite on WikipediaLook for Nielsbohrite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Nielsbohrite in the Natural History Museum (London) online catalogue |
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Localities for Nielsbohrite |
The 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.
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