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Rameauite

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Formula:
K2Ca(H2[3]O)(H2[5]O)4[(UO2)6O6(OH)4](H2[4]O)
Formerly reported as K2Ca(UO2)6(OH)16.H2O
System:
Monoclinic
Colour:
Orange
Name:
Named after Jacques Rameau, French prospector who discovered the deposit where the mineral was found.
Recent structure refinement shows that it is based on sheets with the β-U3O8 topology, and there are UO6 and UO7 bipyramids; similar sheets are found in spriggite, ianthinite, and wyartite. Adjacent sheets in rameauite are linked via K–O, Ca–O and H bonds. The interlayer space hosts K, Ca and water. The interstitial cations are linked to form infinite chains extending along [101].


Classification of Rameauite

Approved
Approval Year:
1971
4.GB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
B : With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
5.5.2.1

5 : OXIDES CONTAINING URANIUM OR THORIUM
5 : AX3O10·xH2O
7.16.12

7 : Oxides and Hydroxides
16 : Oxides of U

Type Occurrence of Rameauite

Physical Properties of Rameauite

Colour:
Orange
Cleavage:
Distinct/Good
Density:
5.467 g/cm3 (Calculated)

Crystallography of Rameauite

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Space Group Setting:
Cc
Cell Parameters:
a = 13.9458(19) Å, b = 14.3105(19) Å, c = 13.8959(18)Å
β = 118.477(14)°
Ratio:
a:b:c = 0.975 : 1 : 0.971
Unit Cell Volume:
V 2437.7 ų
Z:
4

Optical Data of Rameauite

Type:
Biaxial
Dispersion:
relatively weak

Chemical Properties of Rameauite

Formula:
K2Ca(H2[3]O)(H2[5]O)4[(UO2)6O6(OH)4](H2[4]O)

Formerly reported as K2Ca(UO2)6(OH)16.H2O
All elements listed in formula:
Analytical Data:
From recent structural refinement, electron microprobe, mean of 8 analytical points, wt.%
Empirical Formula:
K1.87(Ca1.10Sr0.04)Σ1.14[(UO2)6O6(OH)4.15]·6H2O

Relationship of Rameauite to other Species

4.GB.05AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O
4.GB.05CompreignaciteK2(UO2)6O4(OH)6 · 7H2O
4.GB.10BecquereliteCa(UO2)6O4(OH)6 · 8H2O
4.GB.10BillietiteBa(UO2)6O4(OH)6 · 4-8H2O
4.GB.10ProtasiteBa(UO2)3O3(OH)2 · 3H2O
4.GB.15Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24•41H2O
4.GB.20BauranoiteBa(UO2)2(OH)6 · 1-2H2O
4.GB.20Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
4.GB.20Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
4.GB.25FourmarieritePb(UO2)4O3(OH)4 · 4H2O
4.GB.30Wölsendorfite(Pb,Ca)U2O7 · 2H2O
4.GB.35MasuyitePb(UO2)3O3(OH)2 · 3H2O
4.GB.40MetavandendriesscheitePbU7O22 · nH2O n < 12
4.GB.40VandendriesscheitePbU7O22 · 12H2O
4.GB.45VandenbrandeiteCu(UO2)(OH)4
4.GB.50SayritePb2(UO2)5O6(OH)2 · 4H2O
4.GB.55CuritePb3(UO2)8O8(OH)6 · 3H2O
4.GB.60Iriginite(UO2)Mo2O7 · 3H2O
4.GB.65UranosphaeriteBi(UO2)O2(OH)
4.GB.70HolfertiteCaxU6+2-xTi(O8-xOH4x) · 3H2O
7.16.1UraniniteUO2
7.16.2Schoepite(UO2)8O2(OH)12 · 12H2O
7.16.3ParaschoepiteUO3 · 2H2O
7.16.4MetaschoepiteUO3 · 1-2H2O
7.16.5MetastudtiteUO4 · 2H2O
7.16.6Studtite[(UO2)(O2)(H2O)2] · H2O
7.16.7IanthiniteU4+(UO2)5O7 · 10H2O
7.16.8CompreignaciteK2(UO2)6O4(OH)6 · 7H2O
7.16.9VandenbrandeiteCu(UO2)(OH)4
7.16.10RoubaultiteCu2(UO2)3(CO3)2O2(OH)2•4H2O
7.16.11BecquereliteCa(UO2)6O4(OH)6 · 8H2O
7.16.13AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O
7.16.14ProtasiteBa(UO2)3O3(OH)2 · 3H2O
7.16.15BillietiteBa(UO2)6O4(OH)6 · 4-8H2O
7.16.16BauranoiteBa(UO2)2(OH)6 · 1-2H2O
7.16.17Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
7.16.18Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
7.16.19OrthobranneriteU4+U6+Ti4O12(OH)2
7.16.20Thorutite(Th,U,Ca)Ti2(O,OH)6
7.16.21Davidite-(La)(La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38
7.16.22Davidite-(Ce)(Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38
7.16.23Brannerite(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6
7.16.24FourmarieritePb(UO2)4O3(OH)4 · 4H2O
7.16.25Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24•41H2O
7.16.26CuritePb3(UO2)8O8(OH)6 · 3H2O
7.16.27MasuyitePb(UO2)3O3(OH)2 · 3H2O
7.16.28VandendriesscheitePbU7O22 · 12H2O
7.16.29MetavandendriesscheitePbU7O22 · nH2O n < 12
7.16.30SayritePb2(UO2)5O6(OH)2 · 4H2O
7.16.31Wölsendorfite(Pb,Ca)U2O7 · 2H2O
7.16.32Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
7.16.33UranosphaeriteBi(UO2)O2(OH)

Other Names for Rameauite

Name in Other Languages:
Afrikaans:Rameauite
German:Rameauit
Spanish:Rameauita

Other Information

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 Rameauite

Reference List:
Cesbron, F., Brown, W. L., Bariand, P., Geffroy, J. (1972) Rameauite and Agrinierite, two new hydrated complex uranyl oxides from Margnac, France. Mineralogical Magazine: 38: 781-789.

Fleischer, M. (1973) New mineral names. American Mineralogist: 58: 805-806.

(1982) Bulletin de la Société française de Minéralogie et de Cristallographie: 105: 606.

Plášil, J., Škoda, R., Čeika, J., Bourgoin, V., Boulliard, J.-C. (2016): Crystal structure of the uranyl-oxide mineral rameauite. European Journal of Mineralogy: 28 (in press); http://forum.amiminerals.it/viewtopic.php?f=5&t=12825&sid=b5a84605a16688a08565e5c22dfd1ca2 (2016)

Internet Links for Rameauite

mindat.org URL:
http://www.mindat.org/min-3356.html
Please feel free to link to this page.

Localities for Rameauite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
France (TL)
 
  • Limousin
    • Haute-Vienne
      • Compreignac
F. Cesbron, W.L. Brown, P. Bariand, J. Geffroy: Mineralogical Magazine 38:781-789 (1972)
Switzerland
 
  • Wallis (Valais)
    • Le Trient Valley
      • Finhaut
        • Emosson
Meisser, N. (2012): La minéralogie de l'uranium dans le massif des Aiguilles Rouges. Matér. Géol. Suisse, Sér. géotech. 96, 183 p.
Meisser, N. (2012): La minéralogie de l'uranium dans le massif des Aiguilles Rouges. Matér. Géol. Suisse, Sér. géotech. 96, 183 p.
USA
 
  • Arizona
    • Coconino Co.
      • Grand Canyon National Park
        • South Rim
          • Orphan District
            • Grand Canyon Village
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 351; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
  • Nevada
    • Esmeralda Co.
      • Silver Peak District
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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