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-Ogooue, Gabon Link to MinDat.org Location Data.

Name Origin:

Named for the locality

Name Pronunciation:

Francevillite + Pronunciation

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-Ogooué, 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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Crystal Structure:

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Mereiter K , Neues Jahrbuch fur Mineralogie, Monatshefte , 1986 (1986) p.552-560, Crystal structure refinement of two francevillites, (Ba,Pb)[(UO2)2V2O8]*5H2O, Locality: Mounana, near Franceville, Gabon

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
Ncalc = 1.7 - 1.73

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:

Bulk Density (Electron Density)=3.89 gm/cc
note: Specific Gravity of Francevillite =4.55 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Francevillite}=1,436.96 barns/electron
U=PE_{Francevillite} x r_electron=5,591.12 barns/cc.

Radioactivity:

GRapi = 3,545,303.50 (Gamma Ray American Petroleum Institute Units)
Concentration of Francevillite per GRapi unit = 282.06 (PPB)

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 Becquerels (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	87,062,270	2.35E-03	3,545,303.50	1,165.58
100 gm / 3.48 cm	8,706,227	2.35E-04	354,530.35	116.56
10 gm / 1.61 cm	870,623	2.35E-05	35,453.03	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:

40.02a.27.01 (40)Hydrated Phosphates, etc

(40.02a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++

(40.02a.27)Dana Group

40.02a.27.01 Francevillite (Ba,Pb)(UO2)2V2O8•5(H2O) Pcan 2/m 2/m 2/m

40.02a.27.02 Curienite Pb(UO2)2V2O8•5(H2O) Pcan 2/m 2/m 2/m

Strunz Class:

04.HB.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.H - V[5,6] Vanadates

04.HB -Uranyl Sorovanadates

04.HB.15 Curienite Pb(UO2)2V2O8•5(H2O) Pcan 2/m 2/m 2/m

04.HB.15 Francevillite (Ba,Pb)(UO2)2V2O8•5(H2O) Pcan 2/m 2/m 2/m

04.HB.15 Fritzscheite Mn(UO2)2[(V,P)O4]2•4(H2O) Pnam 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)

See Also:

Links to other databases for Francevillite :
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
16 - WWW-MINCRYST

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

Francevillite

(Ba,Pb)(UO2)2V2O8•5(H2O)
Dana No: 40.02a.27.01 Strunz No: 04.HB.15
Locality:

Notes: