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Fontanite

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About FontaniteHide

Formula:
Ca(UO2)3(CO3)4 · 3H2O
Colour:
Bright yellow
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
4.19 (Calculated)
Crystal System:
Orthorhombic
Name:
Named by Michel Deliens and Paul Piret in 1992 in honor of François Fontan (1942, Toulouse, France - July 2007), mineralogist and expert on pegmatites at the University of Toulouse, France.
This page provides mineralogical data about Fontanite.


Classification of FontaniteHide

Approved
Approval Year:
1991
First Published:
1992
5.EC.05

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
C : UO2:CO3 < 1:1 - 1:2
15.3.6.1

15 : HYDRATED NORMAL CARBONATES
3 : AmBn(XO3)p·xH2O, with (m+n):p = 1:1

Physical Properties of FontaniteHide

Vitreous
Transparency:
Transparent
Colour:
Bright yellow
Streak:
White
Hardness:
Density:
4.19 g/cm3 (Calculated)
Comment:
Measured >4.10

Optical Data of FontaniteHide

Type:
Biaxial (-)
RI values:
nα = 1.603 nβ = 1.690 nγ = 1.710
2V:
Measured: 50° , Calculated: 48°
Max Birefringence:
δ = 0.107
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v

Chemical Properties of FontaniteHide

Formula:
Ca(UO2)3(CO3)4 · 3H2O
IMA Formula:
Ca(UO2)3(CO3)2O2 · 6H2O

Crystallography of FontaniteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 15.33 Å, b = 17.05 Å, c = 6.93 Å
Ratio:
a:b:c = 0.899 : 1 : 0.406
Unit Cell V:
1,811.34 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Rectangular lath-shaped crystals, elongate [001], platy (010), showing {100} and {010}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.55 (100)
6.94 (50)
4.11 (60)
3.723 (60)
3.460 (50)
3.211 (40)
2.772 (70)

Type Occurrence of FontaniteHide

Place of Conservation of Type Material:
Royal Belgian Institute of Natural Sciences, Brussels, Belgium, RC4216.
Geological Setting of Type Material:
Oxidized zone of a uranium deposit.
Associated Minerals at Type Locality:

Synonyms of FontaniteHide

Other Language Names for FontaniteHide

German:Fontanit
Spanish:Fontanita

Related Minerals - Nickel-Strunz GroupingHide

5.EC.10MetazelleriteCa(UO2)(CO3)2 · 3H2OOrth.
5.EC.10ZelleriteCa(UO2)(CO3)2 · 5H2OOrth.

Fluorescence of FontaniteHide

Light green under long-wave ultraviolet light.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for FontaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Deliens, M., Piret, P. (1992) La fontanite, carbonate hydraté d'uranyle et de calcium, nouvelle espèce minérale de Rabejac, Hérault, France. European Journal of Mineralogy: 4: 1271-1274.
Jambor, J.L., Burke, E.A.J. (1993) New mineral names. American Mineralogist: 78: 845-849.
New Minerals (1997), New Minerals 1990-1994.
Hughes, K.-A., Burns, P.C. (2003a) A new uranyl carbonate sheet in the crystal structure of fontanite, Ca[(UO2)3(CO3)2O2](H2O)6. American Mineralogist: 88: 962-966.
Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for FontaniteHide

Localities for FontaniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic
 
  • Vysočina Region
    • Žďár nad Sázavou District
      • Rožná
        • Rožná deposit
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 2. část. (Kutna Hora, issue 2
France (TL)
 
  • Occitanie
    • Hérault
      • Le Puech
[European Journal of Mineralogy(1992) 4, 1271-1274; Le Règne Minéral 1997, 13, p.5-18]; Bariand, P., Bachet, B., Brassy, C., Medenbach, O., Deliens, M., Vautier, R., & Piret, P. (1993) A New Uranium Mineral from the Talmessi Mine, Iran, and Rabejac, France. Mineralogical Record: 24: 463-467
Mineral and/or Locality  
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