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(Na,Ce,Ba)2TiSi3O5(OH)10 · nH2O
Bright yellow
Crystal System:
Named for the Ilmajok River, located enar the type locality.
This page provides mineralogical data about Ilmajokite.

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Classification of IlmajokiteHide

Approval Year:
First Published:
Approval History:

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

78 : Unclassified Silicates
7 :

Physical Properties of IlmajokiteHide

Transparent, Translucent
Bright yellow

Optical Data of IlmajokiteHide

Biaxial (+)
RI values:
nα = 1.573 nβ = 1.576 nγ = 1.579
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:
r < v strong

Chemical Properties of IlmajokiteHide

(Na,Ce,Ba)2TiSi3O5(OH)10 · nH2O
IMA Formula:
(Na,Ce,Ba)10Ti5Si14O22(OH)44 · nH2O
Common Impurities:

Crystallography of IlmajokiteHide

Crystal System:
Cell Parameters:
a = 23 Å, b = 24.4 Å, c = 37 Å
a:b:c = 0.943 : 1 : 1.516
Unit Cell V:
0.00 ų (Calculated from Unit Cell)

Type Occurrence of IlmajokiteHide

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
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 IlmajokiteHide

Other Language Names for IlmajokiteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
Natrolite1 photo of Ilmajokite associated with Natrolite on

Related Minerals - Nickel-Strunz GroupingHide

9.HB.10RilanditeCr4Al2SiO11 · 5H2O or near

Other InformationHide

Decomposes in water at 20C, giving amorphous silica and in acid, giving slight effervescence and amorphous silica gel.
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 IlmajokiteHide

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.

Internet Links for IlmajokiteHide

Localities for IlmajokiteHide

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)
  • Northern Region
    • Murmanskaya Oblast'
      • Lovozero Massif
        • Karnasurt Mt
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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