Vochtenite Mineral Data

Vochtenite Mineral Data +

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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.

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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:

MonoclinicSpace 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

Diaphaniety:

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

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:

r_electron=3.25 gm/cc
note: r_Vochtenite=3.66 gm/cc.

Fermion Index

Fermion Index = 0.00544
Boson Index = 0.99456

Photoelectric:

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

Radioactivity:

GRapi = 3,993,569.08 (Gamma Ray American Petroleum Institute Units)

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	94,367,869	2.55E-03	3,993,569.08	1,312.95
100 gm / 3.74 cm	9,436,787	2.55E-04	399,356.91	131.30
10 gm / 1.73 cm	943,679	2.55E-05	39,935.69	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:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.23)Dana Group

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

Strunz Class:

VII/E.06-10 VII - Phosphates, Arsenates and Vanadates

VII/E - Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-

VII/E.06 - Vochtenite - Xiangjianite series

VII/E.06-10 Vochtenite (Fe,Mg)Fe[(UO2)(PO4)]4(OH)·12-13(H2O) Unk Mono

VII/E.06-20 Coconinoite Fe2Al2(UO2)2(PO4)4(SO4)(OH)2·18(H2O) C 2/c,Cc Mono

VII/E.06-30 Xiangjiangite (Fe,Al)(UO2)4(PO4)2(SO4)2(OH)·22(H2O) C 2/c or Cc 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 -École des Mines de Paris

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Vochtenite

(Fe++,Mg)Fe+++[(UO2)(PO4)]4(OH)·12-13(H2O)
Dana No: 42.11.23.1 Strunz No: VII/E.06-10
Locality:

Notes: