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Bijvoetite-(Y)

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Johannes Martin Bijvoet [1892–1980]
Formula:
Y8(UO2)16(CO3)16O8(OH)8 · 39H2O
Structural formula (Li et al., 2000): [M83+(H2O)25(UO2)16O8(OH)8(CO3)16](H2O)14, where M= (Y,REE)
System:
Monoclinic
Colour:
Yellow
Lustre:
Vitreous
Hardness:
2
Name:
Named in 1982 by Michel deliens and Paul Piret in honor of Johannes Martin Bijvoet [1892–1980], Dutch crystallographer.
It is one of four Y-UO2-minerals, and one of four Y-U natural salts, beside alwilkinsite-(Y), sejkoraite-(Y) (sulphates) and kamotoite-(Y) (also a carbonate).

As shown by a study of Plášil & Petříček (2016), the crystal structures of bijvoetite-(Y) and kamotoite-(Y) are the same. However, the identity of these two minerals is not yet confirmed.

Classification of Bijvoetite-(Y)

Approved
Approval Year:
1981
5.EB.20

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
B : UO2:CO3 = 1:1
16b.2.4.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
2 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:2
11.11.18

11 : Carbonates
11 : Carbonates of Cr and U
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Type Occurrence of Bijvoetite-(Y)

General Appearance of Type Material:
platy

Physical Properties of Bijvoetite-(Y)

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Yellow
Streak:
Light yellow
Hardness (Mohs):
2
Cleavage:
Distinct/Good
{001)

Crystallography of Bijvoetite-(Y)

Crystal System:
Monoclinic

Optical Data of Bijvoetite-(Y)

Type:
Biaxial (+)
RI values:
nα = 1.600 nβ = 1.650 nγ = 1.722
2V:
Measured: 84° , Calculated: 83°
Max Birefringence:
δ = 0.122
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak
Comments:
Colorless (X), pale yellow (Y), deep yellow (Z)

Chemical Properties of Bijvoetite-(Y)

Formula:
Y8(UO2)16(CO3)16O8(OH)8 · 39H2O

Structural formula (Li et al., 2000): [M83+(H2O)25(UO2)16O8(OH)8(CO3)16](H2O)14, where M= (Y,REE)
All elements listed in formula:
Common Impurities:
Nd,Sm,Gd,Dy

Relationship of Bijvoetite-(Y) to other Species

5.EB.05Rutherfordine(UO2)CO3
5.EB.10Blatonite(UO2)CO3 · H2O
5.EB.15Joliotite(UO2)CO3 · nH2O
11.11.1StichtiteMg6Cr2(OH)16[CO3] · 4H2O
11.11.2Rutherfordine(UO2)CO3
11.11.3Joliotite(UO2)CO3 · nH2O
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)3(CO3)(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
11.11.13SwartziteMgCa(UO2)(CO3)3 · 12H2O
11.11.14RabbittiteCa3Mg3(UO2)2(CO3)6(OH)4 · 18H2O
11.11.15Kamotoite-(Y)Y2(UO2)4(CO3)3O4 · 14H2O
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 · 1.5H2O
11.11.19WidenmannitePb2(OH)2[(UO2)(CO3)2]
11.11.20ZnucaliteZn12Ca(UO2)(CO3)3(OH)22 · 4H2O

Other Names for Bijvoetite-(Y)

Name in Other Languages:

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 Bijvoetite-(Y)

Reference List:
Deliens, M., Piret, P. (1982): Bijvoetite et lepersonnite, carbonates hydrat ́es d’uranyle et de terres rares de Shinkolobwe, Za ̈ıre. Canadian Mineralogist: 20: 231–238 (in French with English abs.); American Mineralogist (1983): 68: 1248.

Li, Y., Burns, P.C., Gault, R. A. (2000): A new rare-earth element uranyl carbonate sheet in the structure of bijvoetite-(Y). Canadian Mineralogist: 38: 153-162.

Burns, P. C. (2005)" U6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

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 Bijvoetite-(Y)

Localities for Bijvoetite-(Y)

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.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Ústí Region
      • Krušné Hory Mts (Erzgebirge)
        • Dubí (Eichwald)
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)]
Democratic Republic of Congo (Zaïre) (TL)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Shinkolobwe
Canadian Mineralogist (1982): 20: 231-238; Nickel & Nichols, 1991 - "Mineral Reference Manual", p22]
Finland
 
  • Northern Finland Region
    • Kuusamo
Al-Ani, Thair and Pakkanen, Lassi (2013): Mini-Atlas of REE-minerals in Finnish Bedrocks. Geologian Tutkimuskeskus/Geological Survey of Finland.
Zimbabwe
 
  • Masvingo
    • Bikita area
[Clark, 1993 - "Hey's Mineral Index"]
Mineral and/or Locality  
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