Francevillite Mineral Data

Francevillite Mineral Data +

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General Francevillite Information

Chemical Formula:

(Ba,Pb)(UO2)2V2O8·5(H2O)

Composition:

Molecular Weight = 978.77 gm

Barium 10.52 % Ba 11.75 % BaO

Uranium 48.64 % U 55.18 % UO₂

Vanadium 10.41 % V 18.58 % V₂O₅

Hydrogen 0.62 % H 5.52 % H₂O

Lead 5.29 % Pb 5.70 % PbO

Oxygen 24.52 % O

______ ______

100.00 % 96.73 % = TOTAL OXIDE

Empirical Formula:

Ba_0.75Pb_0.25(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

Francevillite Image

Images:

Click Here for Larger Francevillite Image

Francevillite Chervetite

Comments: Bottle brown tabular crystals of chervetite on yellow francevilleite.
Location: Mounana, Haut-Ogoue, Gabon. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Francevillite Curienite

Comments: Intense yellow curienite and orange francevillite.
Location: Mouonana, Haut-Ogoue, Gabon. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Francevillite

Comments: Specimen of orange francevillite with minor yellow curienite.
Location: Mouana Mine, Gabon. Scale: Crystal size 4 mm.
© John Veevaert

Images:

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

Francevillite Crystallography

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

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

By Intensity(I/I_o): 2.996(1), 8.4(1), 5.2(0.6),

Forms:

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Forms: [ 1 2 0] [ 1 0 2] [ 1 0 0] [ 0 0 1]

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Physical Properties of Francevillite

Cleavage:

[001] Perfect

Color:

Brownish yellow, Yellow, Yellow green.

Density:

4.55

Hardness:

3 - Calcite

Luster:

Adamantine - Pearly

Streak:

light yellow

Optical Properties of Francevillite

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.

Calculated Properties of Francevillite

Electron Density:

r_electron=3.89 gm/cc
note: r_{Francevillite}=4.55 gm/cc.

Fermion Index

Fermion Index = 0.03433
Boson Index = 0.96567

Photoelectric:

PE_{Francevillite}=1,436.96 barns/electron
U=PE_{Francevillite} x r_electron=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) **
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

Francevillite Classification

Dana Class:

40.2a.27.1 (40)Hydrated Phosphates, etc

(40.2a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++

(40.2a.27)Dana Group

40.2a.27.1 Francevillite (Ba,Pb)(UO2)2V2O8·5(H2O) Pcan 2/m 2/m 2/m

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

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

VII/E.11 - Tyuyamunite series

VII/E.11-10 Vanuralite Al(UO2)2(VO4)2(OH)·11(H2O) A2/a 2/m

VII/E.11-20 Metavanuralite Al(UO2)2(VO4)2(OH)·8(H2O) P 1or P1 Tri

VII/E.11-30 Sengierite Cu2(UO2)2V2O8·6(H2O) P 2₁/a 2/m

VII/E.11-40 Strelkinite Na2(UO2)2V2O8·6(H2O) Pnmm,Pnm2 Ortho

VII/E.11-50 Carnotite K2(UO2)2V2O8·3(H2O) P 2₁/a 2/m

VII/E.11-60 Margaritasite (Cs,K,H3O)2(UO2)2V2O8·(H2O) P 2₁/a 2/m

VII/E.11-70 Vanuranylite? (H3O,Ba,Ca,K)1.6(UO2)2V2O8·4(H2O)(?) C 2/c ? 2/m

VII/E.11-80 Tyuyamunite Ca(UO2)2V2O8·5-8(H2O) Pnan 2/m 2/m 2/m

VII/E.11-90 Metatyuyamunite Ca(UO2)2V2O8·3(H2O) Pnam 2/m 2/m 2/m

VII/E.11-100 Francevillite (Ba,Pb)(UO2)2V2O8·5(H2O) Pcan 2/m 2/m 2/m

VII/E.11-110 Curienite Pb(UO2)2V2O8·5(H2O) Pcan 2/m 2/m 2/m

Other Francevillite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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: