Vochtenite Mineral Data

General Vochtenite Information

Chemical Formula:

(Fe++,Mg)Fe+++[(UO2)(PO4)]4(OH)•12-13(H2O)

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

Empirical Formula:

Fe²⁺_0.75Mg_0.25Fe³⁺(UO₂)₄(PO₄)₄(OH)•12.5(H₂O)

IMA Status:

Approved IMA 1989

Locality:

Bassett mine, Redruth, Cornwall, England. Link to MinDat.org Location Data.

Name Origin:

Named for Renard F. C. Vochten (1933-), mineraloigst, State University of Antwerp, Antwerp, Belgium.

Name Pronunciation:

Vochtenite + Pronunciation

Vochtenite Crystallography

Axial Ratios:

a:b:c =0.6306:1:0.4997

Cell Dimensions:

a = 12.606, b = 19.99, c = 9.99, Z = 3; beta = 102.52° V = 2,457.56 Den(Calc)= 3.66

Crystal System:

Monoclinic Space Group: Unk

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

By Intensity(I/I_o): 9.998(1), 3.475(0.7), 3.333(0.5),

Physical Properties of Vochtenite

Cleavage:

{010} Distinct

Color:

Bronze brown.

Density:

3.65

Diaphaneity:

Translucent to Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Adamantine - Metallic

Streak:

light brown

Optical Properties of Vochtenite

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

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

Electron Density:

Bulk Density (Electron Density)=3.25 gm/cc
note: Specific Gravity of Vochtenite =3.66 gm/cc.

Fermion Index:

Fermion Index = 0.005441132
Boson Index = 0.994558868

Photoelectric:

PE_Vochtenite=1,348.05 barns/electron
U=PE_Vochtenite x r_electron=4,384.73 barns/cc.

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

Dana Class:

42.11.23.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq ï¿½ x(H2O)

(42.11.23)Dana Group

42.11.23.01 Vochtenite (Fe,Mg)Fe[(UO2)(PO4)]4(OH)•12-13(H2O) Unk Mono

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.75,p1212,1990)

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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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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