Mineralogy Database

Fontanite Mineral Data

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General Fontanite Information

Help on Chemical  Formula: Chemical Formula: Ca[(UO2)3(CO3)2O2]•6(H2O)
Help on Composition: Composition: Molecular Weight = 1,110.27 gm
   Calcium    3.61 %  Ca    5.05 % CaO
   Uranium   64.32 %  U    72.96 % UO2
   Hydrogen   1.09 %  H     9.74 % H2O
   Carbon     2.16 %  C     7.93 % CO2
   Oxygen    28.82 %  O
            ______        ______ 
            100.00 %       95.68 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca(UO2)3(CO3)2O2•6(H2O)
Help on Environment: Environment: Uranium deposit. Uranyl-carbonate sheet structure formed under mildly acidic conditions.
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: Rabejec deposit (7 km SSE of Lodeve), Herault, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Francois Fontan, mineralogist, University of Paul-Sabatier, Toulouse, France.
Help on Name Pronunciation: Name Pronunciation: Fontanite + Pronunciation Say FONTANITE
Help on Synonym: Synonym: IMA1991-034
 

Fontanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4033:1:0.89
Help on Cell Dimensions: Cell Dimensions: a = 6.968, b = 17.276, c = 15.377, Z = 4; beta = 90.064° V = 1,851.07 Den(Calc)= 3.98
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.55(1), 2.772(0.7), 4.11(0.6),
 

Physical Properties of Fontanite

Help on Cleavage: Cleavage: {010} Distinct, {001} Distinct, {100} Distinct
Help on Color: Color: Honey yellow.
Help on Density: Density: 4.1
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Fontanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.221 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.258 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1678,KPDmeas= 0.1628,KC= 0.1334
Ncalc = 1.53 - 1.55
Help on Optical Data: Optical Data: Biaxial (-), a=1.603, b=1.69, g=1.71, bire=0.1070, 2V(Calc)=48, 2V(Meas)=50.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Fontanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.55 gm/cc
note: Specific Gravity of Fontanite =4.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0050574907
Boson Index = 0.9949425093
Help on Photoelectric: Photoelectric: PEFontanite =1,688.16 barns/electron
U=PEFontanite x relectron=5,984.66 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,740,222.40 (Gamma Ray American Petroleum Institute Units)
Concentration of Fontanite per GRapi unit = 210.96 (PPB)

Fontanite 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) 6.42 ± 1.60 grams of pure Fontanite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 641.67 ±160.42 grams of pure Fontanite .

Estimated Radioactivity from Fontanite - 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 / 7.75 cm 115,126,520 3.11E-03 4,740,222.40 1,558.43
100 gm / 3.60 cm 11,512,652 3.11E-04 474,022.24 155.84
10 gm / 1.67 cm 1,151,265 3.11E-05 47,402.22 15.58
1 gm / 7.75 mm 115,127 3.11E-06 4,740.22 1.56
0.1 gm / 3.60 mm 11,513 3.11E-07 474.02 0.16
0.01 gm / 1.67 mm 1,151 3.11E-08 47.40 0.02
0.001 gm / 0.78 mm 115 3.11E-09 4.74 0.00

Weight of pure Fontanite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.10 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
 

Fontanite Classification

Help on  Dana Class: Dana Class: 15.03.06.01 (15)Hydrated Carbonates
  (15.03)where A+m B++n (XO3)p � x(H2O), (m+n):p = 1:1 and containing U, Th, Zr, Y
  (15.03.06)Dana Group
 
15.03.06.01 Fontanite Ca[(UO2)3(CO3)2O2]•6(H2O) P 21/n 2/m
Help on  Strunz Class: Strunz Class: 05.EC.05 05 - CARBONATES (NITRATES)
  05.E - Uranyl Carbonates
  05.EC -UO2:CO3 < 1:1 - 1:2
 
05.EC.05 Fontanite Ca[(UO2)3(CO3)2O2]•6(H2O) P 21/n 2/m
 

Other Fontanite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(AmMin, v 88, p 962) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)
Help on See Also: See Also: Links to other databases for Fontanite :
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

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

Fontanite

Ca[(UO2)3(CO3)2O2]•6(H2O)
Dana No: 15.03.06.01 Strunz No: 05.EC.05
Locality:

 

Notes:

 

 
   
 


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