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
Please feel free to link to this page. |
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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) | | 1.942 | | (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 Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure Database |
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| Jobs: | Mining & Geology Jobs |
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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.
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