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Kamotoite-(Y)

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Formula:
Y2O4(UO2)4(CO3)3 · 14H2O
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.


Classification of Kamotoite-(Y)

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)

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)

IMA Formula:
Y2O4(UO2)4(CO3)3 · 14H2O
Elements listed in formula:

Crystallography of Kamotoite-(Y)

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 Volume:
V 3069.8 ų
Z:
4
Comment:
P21/n

Type Occurrence of Kamotoite-(Y)

Relationship of Kamotoite-(Y) to other Species

5.EA.05UM1997-24-CO:CaCuHUCa2Cu(UO2)2(CO3)2O3 · 3H2O
5.EA.10UrancalcariteCa(UO2)3CO3(OH)6 · 3H2O
5.EA.15WyartiteCaU5+(UO2)2(CO3)O4(OH) · 7H2O
5.EA.20Oswaldpeetersite(UO2)2CO3(OH)2 · 4H2O
5.EA.25RoubaultiteCu2O2(UO2)3(CO3)2(OH)2 · 4H2O
5.EA.35SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2O
11.11.1StichtiteMg6Cr2CO3(OH)16 · 4H2O
11.11.2Rutherfordine(UO2)CO3
11.11.3Joliotite(UO2)(CO3) · 2H2O
11.11.4GrimseliteK3Na(UO2)(CO3)3 · H2O
11.11.5BayleyiteMg2(UO2)(CO3)3 · 18H2O
11.11.6MetazelleriteCa(UO2)(CO3)2 · 3H2O
11.11.7ZelleriteCa(UO2)(CO3)2 · 5H2O
11.11.8WyartiteCaU5+(UO2)2(CO3)O4(OH) · 7H2O
11.11.9UrancalcariteCa(UO2)3CO3(OH)6 · 3H2O
11.11.10SharpiteCa(UO2)6(CO3)5(OH)4 · 6H2O
11.11.11VogliteCa2Cu(UO2)(CO3)4 · 6H2O
11.11.12AndersoniteNa2Ca(UO2)(CO3)3 · 6H2O
11.11.13SwartziteCaMg(UO2)(CO3)3 · 12H2O
11.11.14RabbittiteCa3Mg3(UO2)2(CO3)6(OH)4 · 18H2O
11.11.16Shabaite-(Nd)CaNd2(UO2)(CO3)4(OH)2 · 6H2O
11.11.17Astrocyanite-(Ce)Cu2Ce2(UO2)(CO3)5(OH)2 · 1.5H2O
11.11.18Bijvoetite-(Y)Y8(UO2)16O8(CO3)16(OH)8 · 39H2O
11.11.19WidenmannitePb2UO2(CO3)2(OH)2
11.11.20ZnucaliteCaZn11(UO2)(CO3)3(OH)20 · 4H2O

Other Names for Kamotoite-(Y)

Name in Other Languages:

Other Information

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)

Reference List:
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. (2016) Crystal structure of the (REE)-uranyl carbonate mineral kamotoite-(Y). Mineralogical Magazine: 80: (in press); http://forum.amiminerals.it/viewtopic.php?f=5&t=12849 (2016)

Internet Links for Kamotoite-(Y)

mindat.org URL:
https://www.mindat.org/min-2150.html
Please feel free to link to this page.

Localities for Kamotoite-(Y)

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.
(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.
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)
    • Katanga Copper Crescent
      • 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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