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Ilmajokite-(Ce)

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About Ilmajokite-(Ce)Hide

Formula:
Na11KBaCe2Ti12Si37.5O94(OH)31·29H2O
formerly given as (Na,Ce,Ba)2TiSi3O5(OH)10.nH2O and (Na,Ce,Ba)10Ti5Si14O22(OH)44.nH2O
Colour:
Bright yellow
Lustre:
Vitreous
Hardness:
1
Crystal System:
Monoclinic
Name:
Named for the Ilmajok River, located enar the type locality.
The crystal structure is based upon complex porous titanosilicate framework in which the SiO4 tetrahedra form a three-dimensional structure with a previously unknown topology.

Third most structurally complex mineral after ewingite and morrisonite.

Structural complexity: 8.468 bits per atom; 11990.129 bits per cell.

The most complex mineral framework structure (complexity comparable to that of paulingite-Ca).


Classification of Ilmajokite-(Ce)Hide

Approved
Notes:
Redefined by the IMA, Renamed by the IMA
Approval Year:
1971
First Published:
1972
Approval History:
Approved as IMA1971-027, as Ilmajokite.
2019: Revised chemical formula as Na11KBaCe2Ti12Si37.5O94(OH)31·29H2O and renamed as Ilmajokite-(Ce). (CNMNC Newsletter 53)
9.HB.05

9 : SILICATES (Germanates)
H : Unclassified silicates
B : With Ti, V, Cr
78.7.5.1

78 : Unclassified Silicates
7 :

Physical Properties of Ilmajokite-(Ce)Hide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Bright yellow
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect

Optical Data of Ilmajokite-(Ce)Hide

Type:
Biaxial (+)
RI values:
nα = 1.573 nβ = 1.576 nγ = 1.579
2V:
Measured: 90° , Calculated: 88°
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v strong

Chemical Properties of Ilmajokite-(Ce)Hide

Formula:
Na11KBaCe2Ti12Si37.5O94(OH)31·29H2O

formerly given as (Na,Ce,Ba)2TiSi3O5(OH)10.nH2O and (Na,Ce,Ba)10Ti5Si14O22(OH)44.nH2O
IMA Formula:
(Na,Ce,Ba)10Ti5Si14O22(OH)44 · nH2O
Common Impurities:
Zr,Al,TR,Fe,Nb,Ta,Ca,Sr,K,C

Crystallography of Ilmajokite-(Ce)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 35.908(5) Å, b = 27.784(3) Å, c = 33.126(4) Å
β = 96.494(3)°
Ratio:
a:b:c = 1.292 : 1 : 1.192
Unit Cell V:
32,836.70 ų (Calculated from Unit Cell)

Type Occurrence of Ilmajokite-(Ce)Hide

General Appearance of Type Material:
Granular deposits, crusts, and brushes of crystals.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, 3152, 3153.
Mining Institute, St. Petersburg, 1061/1-2.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 74041, 74080, 74490, 74491.
National School of Mines, Paris, France.
Geological Setting of Type Material:
Alkaline pegmatite
Reference:
Bussen, I.V., Gannibal, L.F., Goiko, E.A., Mer'kov, A.N., Nedorezova, A.P. (1972) Ilmajokite, a new mineral from the Lovozero Tundra. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 101(1): 75-79.

Synonyms of Ilmajokite-(Ce)Hide

Other Language Names for Ilmajokite-(Ce)Hide

German:Ilmajokit
Spanish:Ilmajokita

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Ilmajokite-(Ce) associated with NatroliteNa2Al2Si3O10 · 2H2O

Related Minerals - Nickel-Strunz GroupingHide

9.HB.10RilanditeCr4Al2SiO11 · 5H2O or near

Other InformationHide

Notes:
Decomposes in water at 20C, giving amorphous silica and in acid, giving slight effervescence and amorphous silica gel.
Special Storage/
Display Requirements:
Unstable in ambient conditions
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 Ilmajokite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bussen, I.V., Gannibal, L.F., Goiko, E.A., Mer'kov, A.N., Nedorezova, A.P. (1972) Ilmajokite, a new mineral from the Lovozero Tundra. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 101(1): 75-79.
Fleischer, M. (1973) New mineral names. American Mineralogist: 58: 139-141.
Andrey Zolotarev, Sergey Krivovichev, Elena Zhitova1, Matteo Leoni, Lyudmila Lyalina (2018) The crystal structure and structural complexity of ilmajokite. In: abstracts of the 22nd IMA Meeting Melbourne: 244.
Zolotarev Jr, A.A., Krivovichev, S.V., Cámara, F., Bindi, L., Zhitova, E.S., Hawthorne, F.C., Sokolova, E. (2020) Extraordinary structural complexity of ilmajokite: a multilevel hierarchical framework structure of natural origin. IUCrJ: 7: 121–128; http://forum.amiminerals.it/viewtopic.php?f=5&t=15979&sid=e3c24a181446502b0534fe81dd361df9
Miyawaki, R., Hatert, F., Pasero, M., Mills, S.J. (2020) CNMNC Newsletter 53. European Journal of Mineralogy: 32: 209-213. https://doi.org/10.5194/ejm-32-209-2020

Internet Links for Ilmajokite-(Ce)Hide

Localities for Ilmajokite-(Ce)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.
Russia (TL)
 
  • Murmansk Oblast
    • Lovozersky District
      • Karnasurt Mountain
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Pluth, J. J., Smith, J. V., Pushcharovsky, D. Y., Semenov, E. I., Bram, A., Riekel, C., ... & Broach, R. W. (1997). Third-generation synchrotron x-ray diffraction of 6-μm crystal of raite,≈ Na3Mn3Ti0. 25Si8O20 (OH) 2⋅ 10H2O, opens up new chemistry and physics of low-temperature minerals. Proceedings of the National Academy of Sciences, 94(23), 12263-12267.
 
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