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Ilímaussite-(Ce)

Big Photo

Ilimaussite occurrence, Nakalak (Nakalaq; Nakkaalaaq) Mt., Tasseq area, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland
© Knut Eldjarn

Formula:
(Na,K)
 
7-8
(Ba,K)
 
10
Ce
 
5
(Nb,Ti)
 
6
[O
 
6
|Si
 
9
O
 
18
(O,OH)
 
24
|(Si
 
6
O
 
18
)
 
2
]
System:HexagonalColour:Brownish yellow
Hardness:4
Name:Named for the type locality at Nakalak (Nakalaq) Mountain, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland.
This page provides mineralogical data about Ilímaussite-(Ce).

Classification of Ilímaussite-(Ce)

IMA status:Approved 1965
Strunz 8th edition ID:8/H.38-57
Nickel-Strunz 10th (pending) edition ID:9.CB.15

9 : SILICATES (Germanates)
C : Cyclosilicates
B : [Si3O9]6- 3-membered single rings, with insular complex anions
Dana 8th edition ID:78.7.4.1

78 : Unclassified Silicates
7 :
Hey's CIM Ref.:17.8.14

17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
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Type Occurrence of Ilímaussite-(Ce)

Type Locality:Ilimaussite occurrence, Nakalak (Nakalaq; Nakkaalaaq) Mt., Tasseq area, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland

Physical Properties of Ilímaussite-(Ce)

Lustre:Earthy
Colour:Brownish yellow
Streak:White
Hardness (Mohs):4

Crystallography of Ilímaussite-(Ce)

Crystal System:Hexagonal
Class (H-M):6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:P63/mcm {P63/m 2/c 2/m}

Optical Data of Ilímaussite-(Ce)

Type:Uniaxial (+)
RI values: nω = 1.689 nε = 1.695
Maximum Birefringence:δ = 0.006

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Ilímaussite-(Ce)

Formula:
(Na,K)
 
7-8
(Ba,K)
 
10
Ce
 
5
(Nb,Ti)
 
6
[O
 
6
|Si
 
9
O
 
18
(O,OH)
 
24
|(Si
 
6
O
 
18
)
 
2
]
Essential elements:Ba, Ce, Fe, H, Na, Nb, O, Si
All elements listed in formula:Ba, Ce, H, K, Na, Nb, O, Si, Ti

Relationship of Ilímaussite-(Ce) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.CB.05Roeblingite
Pb
 
2
Ca
 
6
Mn
2+
 
[OH|SO
 
4
|Si
 
3
O
 
9
]
 
2
 · 4H
 
2
O
9.CB.10Diversilite-(Ce)
Na
 
2
(Ba,K)
 
6
Fe
2+
 
Ce
 
2
Ti
 
3
[HSiO
 
4
|Si
 
3
O
 
9
]
 
3
 · 9(OH,H
 
2
O)
Related Minerals - Hey's Index Grouping:

- +
17.8.1Epistolite
Na
 
2
(Nb,Ti)
 
2
[O
 
2
|Si
 
2
O
 
7
] · nH
 
2
O
17.8.2Murmanite
Na
 
2
(Ti,Nb)
 
2
Si
 
2
O
 
9
·nH
 
2
O
17.8.3Perraultite
BaNaTi
 
2
 Mn
2+
4
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH)
 
2
F
17.8.4Niocalite
(Ca,Nb)
 
4
[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
17.8.5Mongolite
Ca
 
4
Nb
 
6
Si
 
5
O
 
24
(OH)
 
10
·nH
 
2
O
17.8.6Fersmanite
(Ca,Na)
 
4
(Ti,Nb)
 
2
Si
 
2
O
 
11
(F,OH)
 
2
17.8.7Nacareniobsite-(Ce)
Na
 
3
Ca
 
3
(Ce,La,Nd)Nb[F
 
3
|O|(Si
 
2
O
 
7
)
 
2
]
17.8.8Nenadkevichite
(Na,[])
 
8
Nb
 
4
(Si
 
4
O
 
12
)
 
2
(O,OH)
 
4
·8H
 
2
O
17.8.9Natrokomarovite
(Na,Ca,H)
 
2
Nb
 
2
Si
 
2
O
 
10
(OH,F)
 
2
·H
 
2
O
17.8.10Wöhlerite
NaCa
 
2
(Zr,Nb)[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
17.8.11Belkovite
Ba
 
3
(Nb,Ti)
 
6
[O
 
6
|Si
 
2
O
 
7
]
 
2
17.8.12Baotite
Ba
 
4
(Ti,Nb)
 
8
Si
 
4
O
 
28
Cl
17.8.13Shcherbakovite
Na(K,Ba)
 
2
(Ti,Nb)
 
2
[O|Si
 
2
O
 
6
]
 
2
17.8.15Komarovite
(Ca,Mn)Nb
 
2
[O
 
3
|Si
 
2
O
 
7
] · 3.5H
 
2
O
17.8.16Manganbelyankinite
(Mn,Ca)(Ti,Nb)
 
5
O
 
12
·9H
 
2
O
17.8.17Niobophyllite
(K,Na)
 
3
(Fe,Mn)
 
6
(Nb,Ti)
 
2
Si
 
8
(O,OH,F)
 
31
17.8.18Caesium-Kupletskite

Other Names for Ilímaussite-(Ce)

Synonyms:
IMA1965-025
Other Languages:
Russian:Илимаусит-(Ce)

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ilímaussite-(Ce)

Reference List:American Mineralogist (1969):54: 992.

Ferraris, G. et al. (2004): The crystal structure of Ilimaussite-(Ce) and the “Ilimaussite” problem, Canadian Mineralogist, Vol. 42, 787-795

Meddelelser om Grønland: 181(7): 3-7.

Internet Links for Ilímaussite-(Ce)

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  • Raman and XRD data at RRUFF project
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    Localities for Ilímaussite-(Ce)

    (TL) indicates type locality. ? 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.
    Greenland
     
    • Kitaa (West Greenland) Province
      • Narsaq
        • Ilimaussaq complex
          • Tasseq area
            • Nakalak (Nakalaq; Nakkaalaaq) Mt.
    		Semenov, E.I., Kazakova, M.E., Bukin, V.J. (1968): Ilimaussite, a new rare earth – niobium – barium silicate, from Ilimaussaq, South Greenland, Medd. Groenland, Vol. 181 (7), 3-7
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    		[World of Stones 95:5-6, p64] (but probably actually Diversilite-(Ce) and not really Nb-dominant Ilimaussite-(Ce).)
    Mineral and/or Locality
    Google
     
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 3rd Nov 2009 10:50:08