Mineralogy Database

Nielsbohrite Mineral Data

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General Nielsbohrite Information

Help on Chemical  Formula: Chemical Formula: K(UO2)3(AsO4)(OH)4•H2O
Help on Composition: Composition: Molecular Weight = 1,093.26 gm
   Potassium   1.54 %  K     1.85 % K2O
   Uranium    68.80 %  U    78.05 % UO2
   Arsenic     6.76 %  As   10.38 % As2O5
   Hydrogen    0.55 %  H     4.94 % H2O
   Oxygen     22.34 %  O
             ______        ______ 
             100.00 %       95.22 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.43(UO2)3.16(AsO4)0.98(OH)4•(H2O)
Help on Environment: Environment: Secondary mineral assemblage of the uranium deposit. New structure type.
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: Menzenschwand, Southern Black Forest, Baden-W�rttemberg, Germany Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Niels Henrik David Bohr (1885-1962), Danish physicist and Nobel Prize winner in Physics (1922) who made fundamental contributions to understanding atomic structure and qua ntum mechanics.
Help on Synonym: Synonym: IMA2002-045b
 

Nielsbohrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7167:1:1.1811
Help on Cell Dimensions: Cell Dimensions: a = 8.193, b = 11.43, c = 13.5, Z = 4; V = 1,264.22 Den(Calc)= 5.74
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C ccm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.03(1), 3.33(0.8), 6.71(0.8),3.78(0.7), 2.96(0.6), 1.942(0.5), 2.63(0.5), 2.88(0.4),
 

Physical Properties of Nielsbohrite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Irregular - Very brittle fracture producing irregular fragments
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: pale yellow
 

Optical Properties of Nielsbohrite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.151 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1327,KC= 0.1153
Ncalc = 1.66
Help on Optical Data: Optical Data: Biaxial (-), a=1.756, b=1.764, g=1.765, bire=0.0090, 2V(Calc)=38, 2V(Meas)=35. Dispersion strong, r > v.
 

Calculated Properties of Nielsbohrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.83 gm/cc
note: Specific Gravity of Nielsbohrite =5.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.005063593
Boson Index = 0.994936407
Help on Photoelectric: Photoelectric: PENielsbohrite =1,861.86 barns/electron
U=PENielsbohrite x relectron=8,985.70 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,930,850.22 (Gamma Ray American Petroleum Institute Units)
Concentration of Nielsbohrite per GRapi unit = 202.80 (PPB)

Nielsbohrite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 6.17 ± 1.54 grams of pure Nielsbohrite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 616.86 ±154.22 grams of pure Nielsbohrite .

Estimated Radioactivity from Nielsbohrite - very strong
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 6.93 cm 123,154,109 3.33E-03 4,930,850.22 1,621.10
100 gm / 3.22 cm 12,315,411 3.33E-04 493,085.02 162.11
10 gm / 1.49 cm 1,231,541 3.33E-05 49,308.50 16.21
1 gm / 6.93 mm 123,154 3.33E-06 4,930.85 1.62
0.1 gm / 3.22 mm 12,315 3.33E-07 493.09 0.16
0.01 gm / 1.49 mm 1,232 3.33E-08 49.31 0.02
0.001 gm / 0.69 mm 123 3.33E-09 4.93 0.00

Weight of pure Nielsbohrite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.74 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
 

Nielsbohrite Classification

Help on  Dana Class: Dana Class: 42.01.03.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.01)where (A)3 (XO4) Zq � x(H2O)
  (42.01.03)Dana Group
 
42.01.03.01 Nielsbohrite! K(UO2)3(AsO4)(OH)4•H2O C ccm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.EC.45 08 - PHOSPHATES, ARSENATES, VANADATES
  08.E - Uranyl Phosphates and Arsenates
  08.EC -UO2:RO4 = 3:2
 
08.EC.45 Nielsbohrite! K(UO2)3(AsO4)(OH)4•H2O C ccm 2/m 2/m 2/m
 

Other Nielsbohrite Information

Help on References: References: NAME( EurJMin, v21:515) PHYS. PROP.(EurJMin, v21:515) OPTIC PROP.(EurJMin, v21:515)
Help on See Also: See Also: Links to other databases for Nielsbohrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Nielsbohrite Specimen Label here :

Nielsbohrite

K(UO2)3(AsO4)(OH)4•H2O
Dana No: 42.01.03.01 Strunz No: 08.EC.45
Locality:

 

Notes:

 

 
   
 


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