Nielsbohrite Mineral Data

[Thumbnails] [Miniatures] [Cabinets] [About Us] [FAQ]
Welcome To Mason's Minerals
Your Source for Beautiful Minerals and Crystals
We offer a no-questioned-asked Satisfaction Guarantee

General Nielsbohrite Information

Chemical Formula:

K(UO2)3(AsO4)(OH)4•H2O

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

Empirical Formula:

K_0.43(UO₂)_3.16(AsO₄)_0.98(OH)₄•(H₂O)

Environment:

Secondary mineral assemblage of the uranium deposit. New structure type.

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Menzenschwand, Southern Black Forest, Baden-Württemberg, Germany Link to MinDat.org Location Data.

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.

Synonym:

IMA2002-045b

Search for Nielsbohrite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Nielsbohrite Crystallography

Axial Ratios:

a:b:c =0.7167:1:1.1811

Cell Dimensions:

a = 8.193, b = 11.43, c = 13.5, Z = 4; V = 1,264.22 Den(Calc)= 5.74

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C ccm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

None

Color:

Yellow.

Diaphaneity:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

2 - Gypsum

Luster:

Vitreous - Dull

Streak:

pale yellow

Optical Properties of Nielsbohrite

Gladstone-Dale:

CI calc= -0.151 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1327,KC= 0.1153
Ncalc = 1.66

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

Electron Density:

Bulk Density (Electron Density)=4.83 gm/cc
note: Specific Gravity of Nielsbohrite =5.74 gm/cc.

Fermion Index:

Fermion Index = 0.005063593
Boson Index = 0.994936407

Photoelectric:

PE_Nielsbohrite=1,861.86 barns/electron
U=PE_Nielsbohrite x r_electron=8,985.70 barns/cc.

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

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

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

References:

NAME( EurJMin, v21:515) PHYS. PROP.(EurJMin, v21:515) OPTIC PROP.(EurJMin, v21:515)

See Also:

Links to other databases for Nielsbohrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Nielsbohrite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Nielsbohrite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Nielsbohrite Mineral Data :

Ask about Nielsbohrite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: