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Kamotoite-(Y)

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Formula:
Y2(UO2)4(CO3)3O4 · 14H2O
Crystal System:
Monoclinic
Name:
Named by M. Deliens and P. Piret in 1986 after the town of Kamoto, Katanga, Democratic Republic of Congo, where the type locality is situated.
One of 4 currently known yttrium-uranium(uranyl) minerals of the natural salts class; the other representatives of this group are bijvoetite-(Y) (carbonate), alwilkinsite-(Y) and sejkoraite-(Y) (sulphates). Kamotoite-(Y) is thus the second natural Y-U carbonate after bijvoetite-(Y).

The similarity of kamotoite-(Y) and bijvoetite-(Y) may be more than chemical in natue, as Plášil & Petříček (2016) have shown that structures of these two minerals are the same (although the identity of these two minerals is not yet confirmed). Nevertheless, the XR pattern is pseudo-orthorhombic due to twinning, and the structure is based on sheets of the bijvoetite-(Y) uranyl/anion-topology, the sheets being electroneutral. Water resides in the interlayer space and does not directly coordinate any cation.


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Classification of Kamotoite-(Y)Hide

Approved
Approval Year:
1985
First Published:
1986
5.EA.30

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
A : UO2:CO3 > 1:1
16b.3.3.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : AmBn(XO3)pZqxH2O & with (m+n):p = 2:1
11.11.15

11 : Carbonates
11 : Carbonates of Cr and U

Optical Data of Kamotoite-(Y)Hide

Type:
Biaxial (-)
RI values:
nα = 1.604 nβ = 1.667 nγ = 1.731
2V:
Measured: 87° , Calculated: 86°
Max Birefringence:
δ = 0.127
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v

Chemical Properties of Kamotoite-(Y)Hide

Formula:
Y2(UO2)4(CO3)3O4 · 14H2O
IMA Formula:
Y2O4(UO2)4(CO3)3 · 14H2O

Crystallography of Kamotoite-(Y)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 12.3525(5) Å, b = 12.9432(5) Å, c = 19.4409(7) Å
β = 99.857(3)°
Ratio:
a:b:c = 0.954 : 1 : 1.502
Unit Cell V:
3069.8 ų
Z:
4
Comment:
space group is P21/n

Type Occurrence of Kamotoite-(Y)Hide

Synonyms of Kamotoite-(Y)Hide

Other Language Names for Kamotoite-(Y)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Astrocyanite-(Ce)8 photos of Kamotoite-(Y) associated with Astrocyanite-(Ce) on mindat.org.
Uraninite3 photos of Kamotoite-(Y) associated with Uraninite on mindat.org.
Uranophane2 photos of Kamotoite-(Y) associated with Uranophane on mindat.org.
Shabaite-(Nd)1 photo of Kamotoite-(Y) associated with Shabaite-(Nd) on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.EA.05UM1997-24-CO:CaCuHUCa2Cu(UO2)2(CO3)2O3 · 3H2O
5.EA.10UrancalcariteCa(UO2)3(CO3)(OH)6 · 3H2OOrth.
5.EA.15WyartiteCaU5+(UO2)2(CO3)O4(OH) · 7H2OOrth.
5.EA.20Oswaldpeetersite(UO2)2(CO3)(OH)2 · 4H2OMon. 2/m : P21/b
5.EA.25RoubaultiteCu2(UO2)3(CO3)2O2(OH)2•4H2OTric. 1 : P1
5.EA.35SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.11.1StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
11.11.2Rutherfordine(UO2)CO3Orth. mm2 : Imm2
11.11.3Joliotite(UO2)CO3 · nH2OOrth.
11.11.4GrimseliteK3Na(UO2)(CO3)3 · H2OHex.
11.11.5BayleyiteMg2(UO2)(CO3)3 · 18H2OMon.
11.11.6MetazelleriteCa(UO2)(CO3)2 · 3H2OOrth.
11.11.7ZelleriteCa(UO2)(CO3)2 · 5H2OOrth.
11.11.8WyartiteCaU5+(UO2)2(CO3)O4(OH) · 7H2OOrth.
11.11.9UrancalcariteCa(UO2)3(CO3)(OH)6 · 3H2OOrth.
11.11.10SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2OOrth.
11.11.11VogliteCa2Cu(UO2)(CO3)4 · 6H2OMon.
11.11.12AndersoniteNa2Ca(UO2)(CO3)3 · 6H2OTrig. 3 : R3
11.11.13SwartziteMgCa(UO2)(CO3)3 · 12H2OMon. 2/m : P21/m
11.11.14RabbittiteCa3Mg3(UO2)2(CO3)6(OH)4 · 18H2OMon.
11.11.16Shabaite-(Nd)Ca(Nd,Sm,Y)2(UO2)(CO3)4(OH)2 · 6H2O
11.11.17Astrocyanite-(Ce)Cu2(Ce,Nd,La)2(UO2)(CO3)5(OH)2 · 1.5H2OHex.
11.11.18Bijvoetite-(Y)Y8(UO2)16(CO3)16O8(OH)8 · 39H2OMon.
11.11.19WidenmannitePb2(OH)2[(UO2)(CO3)2]Orth.
11.11.20ZnucaliteZn12Ca(UO2)(CO3)3(OH)22 · 4H2OOrth.

Other InformationHide

Special Storage/
Display Requirements:
Radioactive
Health Risks:
This radioactive specie sit always on massive uraninite and should be manipulated and stored with precautions.

References for Kamotoite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Deliens, M., Piret, P. (1986) La kamototïte-(Y), un nouveau carbonate d'uranyle et de terres rares de Kamoto, Shaba, Zaïre. Bulletin de la Société française de Minéralogie et de Cristallographie: 109: 643-647.
Hawthorne, F.C., Burke, E.A.J., Ercit, T.S., Grew, E.S., Grice, J.D., Jambor, J.L., Puziewicz, J., Roberts, A.C., Vanko, D.A. (1988) New mineral names. American Mineralogist: 73: 189-199.
Deliens, M., Piret, P., Van Der Meersche, E. (1990) Les minéraux secondaires d'uranium du Zaïre, deuxieme complement. Institut royal des sciences naturelles de Belgique, 39 pages.
Plášil, J. & Petříček, V. (2017): Crystal structure of the (REE)-uranyl carbonate mineral kamotoite-(Y). Mineralogical Magazine: 81: 653-660.

Internet Links for Kamotoite-(Y)Hide

Localities for Kamotoite-(Y)Hide

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.
Canada
 
  • Ontario
    • Nipissing District
      • Murchison Township
ontariominerals.com; Rocks & Min. (2007) 82:232-233
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
Lapis 2002(7/8), 63-65
Democratic Republic of Congo (Zaïre) (TL)
 
  • Katanga (Shaba)
    • Kolwezi District
      • Kamoto
Deliens, M., Piret, P. (1986) La kamototïte-(Y), un nouveau carbonate d'uranyle et de terres rares de Kamoto, Shaba, Zaïre. Bulletin de la Société française de Minéralogie et de Cristallographie: 109: 643-647; Eur. J. Mineral., 1990, 2
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
        • Wittichen
          • Böckelsbach valley
Markl, G. & Slotta, C. (2011): Die Uranmineralien des Lagerstättenreviers Wittichen im mittleren Schwarzwald. Lapis 36 (3), 25-37; 54 (in German).
Norway
 
  • Buskerud
    • Krødsherad
      • Krøderen Lake
Kristiansen, R. (1990): Nye sekundære uranmineraler fra Bjertnes, Krødsherad. STEIN 17(1), 25-28
Switzerland
 
  • Wallis (Valais)
    • Le Trient Valley
      • Finhaut
        • Giétroz
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 236.; Meisser, N. (2012): La minéralogie de l'uranium dans le massif des Aiguilles Rouges. Matér. Géol. Suisse, Sér. géotech. 96, 183 p.
Mineral and/or Locality  
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