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Rameauite

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About RameauiteHide

Formula:
K2Ca(H[3]2O)(H[5]2O)4[(UO2)6O6(OH)4](H[4]2O)
The correct formula is the one in the "formula" field, corresponding to K2Ca(UO2)6O6(OH)4.6H2O; formerly reported as K2Ca(UO2)6(OH)16.H2O
Colour:
Orange
Specific Gravity:
5.467 (Calculated)
Crystal System:
Monoclinic
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]. The formula obtained from the refined structure is K2Ca[(UO2)6O6(OH)4](H2O)6, Z = 4.


Classification of RameauiteHide

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

Physical Properties of RameauiteHide

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

Optical Data of RameauiteHide

Type:
Biaxial
Dispersion:
relatively weak

Chemical Properties of RameauiteHide

Formula:
K2Ca(H[3]2O)(H[5]2O)4[(UO2)6O6(OH)4](H[4]2O)

The correct formula is the one in the "formula" field, corresponding to K2Ca(UO2)6O6(OH)4.6H2O; formerly reported as K2Ca(UO2)6(OH)16.H2O
IMA Formula:
K2Ca(UO2)6O6(OH)4 · 6H2O

Crystallography of RameauiteHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
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 V:
2437.7 ų
Z:
4

Type Occurrence of RameauiteHide

Synonyms of RameauiteHide

Other Language Names for RameauiteHide

Afrikaans:Rameauite
German:Rameauit
Spanish:Rameauita

Related Minerals - Nickel-Strunz GroupingHide

4.GB.05AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2OOrth.
4.GB.05CompreignaciteK2(UO2)6O4(OH)6 · 7H2OOrth.
4.GB.10BecquereliteCa(UO2)6O4(OH)6 · 8H2OOrth. mm2 : Pna21
4.GB.10BillietiteBa(UO2)6O4(OH)6 · 4-8H2OOrth. mm2
4.GB.10ProtasiteBa(UO2)3O3(OH)2 · 3H2OMon.
4.GB.15Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24•41H2O Tric.
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 · 4H2OOrth.
4.GB.30WölsendorfitePb7(UO2)14O19(OH)4 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
4.GB.35MasuyitePb(UO2)3O3(OH)2 · 3H2OOrth.
4.GB.40MetavandendriesscheitePbU7O22 · nH2O n < 12Orth.
4.GB.40VandendriesscheitePbU7O22 · 12H2O
4.GB.45VandenbrandeiteCu(UO2)(OH)4Tric. 1 : P1
4.GB.50SayritePb2(UO2)5O6(OH)2 · 4H2OMon.
4.GB.55CuritePb3(UO2)8O8(OH)6 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pnma
4.GB.60Iriginite(UO2)Mo2O7 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
4.GB.65UranosphaeriteBi(UO2)O2(OH)Mon. 2/m
4.GB.70HolfertiteCaxU6+2-xTi(O8-xOH4x) · 3H2OTrig. 3 : P3

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.16.1UraniniteUO2Iso. m3m (4/m 3 2/m) : Fm3m
7.16.2Schoepite(UO2)8O2(OH)12 · 12H2OOrth. mmm (2/m 2/m 2/m) : Pbca
7.16.3ParaschoepiteUO3 · 2H2OOrth.
7.16.4Metaschoepite(UO2)8O2(OH)12 · 10H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
7.16.5MetastudtiteUO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
7.16.6Studtite[(UO2)(O2)(H2O)2] · H2OMon.
7.16.7IanthiniteU4+(UO2)5O7 · 10H2OOrth. mm2 : Amm2
7.16.8CompreignaciteK2(UO2)6O4(OH)6 · 7H2OOrth.
7.16.9VandenbrandeiteCu(UO2)(OH)4Tric. 1 : P1
7.16.10RoubaultiteCu2(UO2)3(CO3)2O2(OH)2•4H2OTric. 1 : P1
7.16.11BecquereliteCa(UO2)6O4(OH)6 · 8H2OOrth. mm2 : Pna21
7.16.13AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2OOrth.
7.16.14ProtasiteBa(UO2)3O3(OH)2 · 3H2OMon.
7.16.15BillietiteBa(UO2)6O4(OH)6 · 4-8H2OOrth. mm2
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)2Orth.
7.16.20Thorutite(Th,U,Ca)Ti2(O,OH)6Mon.
7.16.21Davidite-(La)(La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig.
7.16.22Davidite-(Ce)(Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig. 3 : R3
7.16.23Brannerite(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6Mon. 2/m : B2/m
7.16.24FourmarieritePb(UO2)4O3(OH)4 · 4H2OOrth.
7.16.25Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24•41H2O Tric.
7.16.26CuritePb3(UO2)8O8(OH)6 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pnma
7.16.27MasuyitePb(UO2)3O3(OH)2 · 3H2OOrth.
7.16.28VandendriesscheitePbU7O22 · 12H2O
7.16.29MetavandendriesscheitePbU7O22 · nH2O n < 12Orth.
7.16.30SayritePb2(UO2)5O6(OH)2 · 4H2OMon.
7.16.31WölsendorfitePb7(UO2)14O19(OH)4 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
7.16.32Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2OTrig.
7.16.33UranosphaeriteBi(UO2)O2(OH)Mon. 2/m

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 RameauiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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, 959–967.

Internet Links for RameauiteHide

Localities for RameauiteHide

ⓘ - 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.
France (TL)
 
  • Nouvelle-Aquitaine
    • 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.
      • 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.
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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