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Ilímaussite-(Ce)

Big Photo

Tasseq Slope (Taseq Slope), 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:Nakalak (Nakalaq) Mt., 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
(Na,Ca)(Ba,K)(Mn,Fe)
 
4
(Ti,Nb)
 
2
Si
 
4
O
 
16
(OH,F,O)
 
3
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,Ca)(Nb,Ti)Si
 
2
O
 
7
·2H
 
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
Russian names:
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.: Canadian Mineralogist (2004): 42: 787-795.

Meddelelser om Grønland: 181(7): 3-7.

Internet Links for Ilímaussite-(Ce)

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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
    		Medd. Grönland, 181(7),3{7. (2) (1969) Amer. Mineral., 54, 992{993 (abs. ref. 1).
    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
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