Françoisite-(Ce)

Where it forms, where it's found

Type locality: Mount Painter No. 2 workings
Mount Painter area
Arkaroola (Arkaroola Wilderness Sanctuary
Arkaroola Station)
Pastoral Unincorporated Area
South Australia
Australia
-30.2208°, 139.3322°

2recorded occurrences

Source · OpenStreetMap

Radioactivity

Crystallography

Crystal system: Monoclinic
Space group: #14
Cell parameters: a = 9.295 Å · b = 15.53 Å · c = 13.718 Å
Cell angles: β = 112.39 °
Ratio a:b:c: 1 : 1.671 : 1.476

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
92UUranium Uranium 3 238.029 714.087
55.73%
8OOxygen Oxygen 22 15.999 351.978
27.47%
58CeCerium Cerium 1 140.116 140.116
10.94%
15PPhosphorus Phosphorus 2 30.974 61.948
4.84%
1HHydrogen Hydrogen 13 1.008 13.104
1.02%
Total 1281.233 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From IMA formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
92UUranium	Uranium	3	238.029	714.087	55.73%
8OOxygen	Oxygen	22	15.999	351.978	27.47%
58CeCerium	Cerium	1	140.116	140.116	10.94%
15PPhosphorus	Phosphorus	2	30.974	61.948	4.84%
1HHydrogen	Hydrogen	13	1.008	13.104	1.02%
	Total	1281.233	100.00%

Synonyms

Françoisiet-(Ce)
IMA2004-029

In other languages

German: Françoisit- · Françoisit-(Ce) · IMA 2004-029
Italian: françoisite-(Ce)

Classification

Strunz

10th ed.

8.EC.05

8Phosphates, Arsenates, VanadatesClass
8.EUranyl phosphates and arsenatesDivision
8.ECUO₂:RO₄ = 3:2Group
8.EC.05Françoisite-(Ce)Species

Group, growth & confusion

12 members

1 mineral

Françoisite-(Nd)Nd(UO₂)₃O(OH)(PO₄)₂ · 6H₂O
Mineral
—

Literature, links & citation

Citations

2007Roth, Ph. (2007): Minerals first discovered in Switzerland and minerals named after Swiss individuals. Philippe Roth, Ed., Zurich, 239 pp.
2010Meisser, N., Brugger, J., Ansermet, S., Thelin, P., Bussy, F. (2010) Francoisite-(Ce), a new mineral species from La Creusaz uranium deposit (Valais, Switzerland) and from Radium Ridge (Flinders Ranges, South Australia): Description and genesis. American Mineralogist, 95 (10) 1527-1532 doi:10.2138/am.2010.3413DOI: 10.2138/am.2010.3413
2021(2021) Françoisite-(Ce). Handbook of Mineralogy. Mineralogical Society of America

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Françoisite-(Ce) — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/francoisite-ce-27480},
  note      = {Accessed 2026-05-11}
}