Mineralogy Database

Vochtenite Mineral Data

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General Vochtenite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg)Fe+++[(UO2)(PO4)]4(OH)•12-13(H2O)
Help on Composition: Composition: Molecular Weight = 1,806.00 gm
   Magnesium    0.34 %  Mg    0.56 % MgO
   Uranium     52.72 %  U    59.81 % UO2
   Iron         5.41 %  Fe    2.98 % FeO /  4.42 % Fe2O3
   Phosphorus   6.86 %  P    15.72 % P2O5
   Hydrogen     1.45 %  H    12.97 % H2O
   Oxygen      33.22 %  O
              ______        ______ 
              100.00 %       96.46 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+0.75Mg0.25Fe3+(UO2)4(PO4)4(OH)•12.5(H2O)
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Bassett mine, Redruth, Cornwall, England. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Renard F. C. Vochten (1933-), mineraloigst, State University of Antwerp, Antwerp, Belgium.
Help on Name Pronunciation: Name Pronunciation: Vochtenite + Pronunciation Say VOCHTENITE
 

Vochtenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6306:1:0.4997
Help on Cell Dimensions: Cell Dimensions: a = 12.606, b = 19.99, c = 9.99, Z = 3; beta = 102.52° V = 2,457.56 Den(Calc)= 3.66
Help on Crystal System: Crystal System: Monoclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.998(1), 3.475(0.7), 3.333(0.5),
 

Physical Properties of Vochtenite

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Bronze brown.
Help on Density: Density: 3.65
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine - Metallic
Help on Streak: Streak: light brown
 

Optical Properties of Vochtenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1609,KPDmeas= 0.1614,KC= 0.1533
Ncalc = 1.56
Help on Optical Data: Optical Data: Biaxial (-), a=1.575, b=1.589, g=1.603, bire=0.0280, 2V(Calc)=88, 2V(Meas)=89.
 

Calculated Properties of Vochtenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.25 gm/cc
note: Specific Gravity of Vochtenite =3.66 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.005441132
Boson Index = 0.994558868
Help on Photoelectric: Photoelectric: PEVochtenite =1,348.05 barns/electron
U=PEVochtenite x relectron=4,384.73 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,993,571.62 (Gamma Ray American Petroleum Institute Units)
Concentration of Vochtenite per GRapi unit = 250.40 (PPB)

Vochtenite 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) 7.62 ± 1.90 grams of pure Vochtenite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 761.64 ±190.41 grams of pure Vochtenite .

Estimated Radioactivity from Vochtenite - 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 / 8.05 cm 94,367,885 2.55E-03 3,993,571.62 1,312.96
100 gm / 3.74 cm 9,436,789 2.55E-04 399,357.16 131.30
10 gm / 1.73 cm 943,679 2.55E-05 39,935.72 13.13
1 gm / 8.05 mm 94,368 2.55E-06 3,993.57 1.31
0.1 gm / 3.74 mm 9,437 2.55E-07 399.36 0.13
0.01 gm / 1.73 mm 944 2.55E-08 39.94 0.01
0.001 gm / 0.81 mm 94 2.55E-09 3.99 0.00

Weight of pure Vochtenite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.66 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
 

Vochtenite Classification

Help on  Dana Class: Dana Class: 42.11.23.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.23)Dana Group
 
42.11.23.01 Vochtenite (Fe,Mg)Fe[(UO2)(PO4)]4(OH)•12-13(H2O) Unk Mono
Help on  Strunz Class: Strunz Class: 08.EB.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.E - Uranyl Phosphates and Arsenates
  08.EB -UO2:RO4 = 1:1
 
08.EB.30 Vochtenite (Fe,Mg)Fe[(UO2)(PO4)]4(OH)•12-13(H2O) Unk Mono
 

Other Vochtenite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.75,p1212,1990)
Help on See Also: See Also: Links to other databases for Vochtenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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

Vochtenite

(Fe++,Mg)Fe+++[(UO2)(PO4)]4(OH)•12-13(H2O)
Dana No: 42.11.23.01 Strunz No: 08.EB.30
Locality:

 

Notes:

 

 
   
 


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