General Francevillite Information
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Chemical Formula: |
(Ba,Pb)(UO2)2V2O8·5(H2O) |
Composition: |
Molecular Weight = 978.77 gm |
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Barium 10.52 % Ba 11.75 % BaO |
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Uranium 48.64 % U 55.18 % UO2 |
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Vanadium 10.41 % V 18.58 % V2O5 |
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Hydrogen 0.62 % H 5.52 % H2O |
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Lead 5.29 % Pb 5.70 % PbO |
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Oxygen 24.52 % O |
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______ ______ |
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100.00 % 96.73 % = TOTAL OXIDE |
Empirical Formula: |
Ba0.75Pb0.25(UO2)2V5+2O8·3(H2O) |
IMA Status: |
Approved IMA 1975 |
Locality: |
Mounana mine, Franceville, Haut-Ogooué, Gabon Link to MinDat.org Location Data. |
Name Origin: |
Named for the locality |
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Francevillite Image |
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Francevillite
Comments: Specimen of orange francevillite with minor yellow curienite.
Location: Mouana Mine, Gabon.
Scale: Crystal size 4 mm.
© John Veevaert |
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Images:
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Francevillite Mounanaite
Comments: Stout, yellow, transparent, prismatic, striated crystals of francevillite on brownish red mounanaite matrix.
Location: Mounana mine, Franceville, Haut-Ogoou?, Gabon.
Scale: Picture size 1.5 cm.
© Paul M. Schumacher |
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Francevillite Crystallography
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Axial Ratios: |
a:b:c =1.2232:1:1.9694 |
Cell Dimensions: |
a = 10.41, b = 8.51, c = 16.76, Z = 4; V = 1,484.75 Den(Calc)= 4.38 |
Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcan |
X Ray Diffraction: |
By Intensity(I/Io): 2.996(1), 8.4(1), 5.2(0.6), |
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Physical Properties of Francevillite
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Cleavage: |
[001] Perfect |
Color: |
Brownish yellow, Yellow, Yellow green. |
Density: |
4.55 |
Hardness: |
3 - Calcite |
Luster: |
Adamantine - Pearly |
Streak: |
light yellow |
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Optical Properties of Francevillite
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Gladstone-Dale: |
CI meas= -0.225 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.273 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2033,KPDmeas= 0.1958,KC= 0.1598 |
Optical Data: |
Biaxial (-), a=1.75-1.785, b=1.91-1.952, g=1.945-2.002, bire=0.1950-0.2170, 2V(Calc)=46-52, 2V(Meas)=52. |
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Calculated Properties of Francevillite
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Electron Density: |
relectron=3.89 gm/cc note: rFrancevillite =4.55 gm/cc. |
Fermion Index |
Fermion Index = 0.03433 Boson Index = 0.96567 |
Photoelectric: |
PEFrancevillite =1,436.96 barns/electron U=PEFrancevillite x relectron=5,591.12 barns/cc. |
Radioactivity: |
GRapi = 3,545,300.98 (Gamma Ray American Petroleum Institute Units)
Francevillite 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)
8.58 ± 2.14 grams of pure Francevillite .
Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 100 cm box)
857.94 ±214.49 grams of pure Francevillite .
Estimated Radioactivity from Francevillite - 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 / 7.49 cm |
87,062,253 |
2.35E-03 |
3,545,300.98 |
1,165.58 |
| 100 gm / 3.48 cm |
8,706,225 |
2.35E-04 |
354,530.10 |
116.56 |
| 10 gm / 1.61 cm |
870,623 |
2.35E-05 |
35,453.01 |
11.66 |
| 1 gm / 7.49 mm |
87,062 |
2.35E-06 |
3,545.30 |
1.17 |
| 0.1 gm / 3.48 mm |
8,706 |
2.35E-07 |
354.53 |
0.12 |
| 0.01 gm / 1.61 mm |
871 |
2.35E-08 |
35.45 |
0.01 |
| 0.001 gm / 0.75 mm |
87 |
2.35E-09 |
3.55 |
0.00 |
Weight of pure Francevillite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.55 gm/cc.*
Goverment Estimate of Average Annual Exposure (
360 mRem)
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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
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Francevillite Classification
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Dana Class: |
40.2a.27.1 (40)Hydrated Phosphates, etc |
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(40.2a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++ |
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(40.2a.27)Dana Group |
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40.2a.27.1 Francevillite (Ba,Pb)(UO2)2V2O8·5(H2O) Pcan 2/m 2/m 2/m |
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40.2a.27.2 Curienite Pb(UO2)2V2O8·5(H2O) Pcan 2/m 2/m 2/m |
Strunz Class: |
VII/E.11-100 VII - Phosphates, Arsenates and Vanadates |
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VII/E - Uranylphosphates and uranylvanadates with: [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-, uranyl-groupvanadates with [UO2]2+ - [V2O8]6- |
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VII/E.11 - Tyuyamunite series |
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VII/E.11-10 Vanuralite Al(UO2)2(VO4)2(OH)·11(H2O) A2/a 2/m |
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VII/E.11-20 Metavanuralite Al(UO2)2(VO4)2(OH)·8(H2O) P 1or P1 Tri |
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VII/E.11-30 Sengierite Cu2(UO2)2V2O8·6(H2O) P 21/a 2/m |
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VII/E.11-40 Strelkinite Na2(UO2)2V2O8·6(H2O) Pnmm,Pnm2 Ortho |
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VII/E.11-50 Carnotite K2(UO2)2V2O8·3(H2O) P 21/a 2/m |
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VII/E.11-60 Margaritasite (Cs,K,H3O)2(UO2)2V2O8·(H2O) P 21/a 2/m |
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VII/E.11-70 Vanuranylite? (H3O,Ba,Ca,K)1.6(UO2)2V2O8·4(H2O)(?) C 2/c ? 2/m |
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VII/E.11-80 Tyuyamunite Ca(UO2)2V2O8·5-8(H2O) Pnan 2/m 2/m 2/m |
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VII/E.11-90 Metatyuyamunite Ca(UO2)2V2O8·3(H2O) Pnam 2/m 2/m 2/m |
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VII/E.11-100 Francevillite (Ba,Pb)(UO2)2V2O8·5(H2O) Pcan 2/m 2/m 2/m |
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VII/E.11-110 Curienite Pb(UO2)2V2O8·5(H2O) Pcan 2/m 2/m 2/m |
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Other Francevillite Information
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References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Francevillite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - Uranium Minerals
14 - WWW-MINCRYST
15 -École des Mines de Paris
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Francevillite
(Ba,Pb)(UO2)2V2O8·5(H2O)
Dana No: 40.2a.27.1 Strunz No: VII/E.11-100
Locality:
Notes:
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