Mineralogy Database

Francevillite Mineral Data

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General Francevillite Information

Help on Chemical  Formula: Chemical Formula: (Ba,Pb)(UO2)2V2O8•5(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ba0.75Pb0.25(UO2)2V5+2O8•3(H2O)
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Mounana mine, Franceville, Haut-Ogooue, Gabon Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality
Help on Name Pronunciation: Name Pronunciation: Francevillite + Pronunciation Say FRANCEVILLITE
 

Francevillite Image

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  Chervetite   Francevillite

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

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  Curienite   Francevillite

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

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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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  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

Help on Axial Ratios: Axial Ratios: a:b:c =1.2232:1:1.9694
Help on Cell Dimensions: Cell Dimensions: a = 10.41, b = 8.51, c = 16.76, Z = 4; V = 1,484.75 Den(Calc)= 4.38
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcan
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.996(1), 8.4(1), 5.2(0.6),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 2 0) ( 1 0 2) ( 1 0 0) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.

 

Physical Properties of Francevillite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Brownish yellow, Yellow, Yellow green.
Help on Density: Density: 4.55
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Adamantine - Pearly
Help on Streak: Streak: light yellow
 

Optical Properties of Francevillite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.89 gm/cc
note: Specific Gravity of Francevillite =4.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEFrancevillite =1,436.96 barns/electron
U=PEFrancevillite x relectron=5,591.12 barns/cc.
Help on Radioactivity: 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
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 87,062,270 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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:

 

 
   
 


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