Sitinakite (original) (raw)

A valid IMA mineral species

About SitinakiteHide

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Formula:

KNa2Ti4(SiO4)2O5(OH) · 4H2O

Colour:

Colourless, light-brown to pale rose, pinkish brown

Crystal System:

Tetragonal

Name:

The name reflects its composition: silicon (Si), titanium (Ti), sodium (Na) and potassium (K).

This page provides mineralogical data about Sitinakite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3677:7

b6229b11-c549-40ff-ac7b-f948a94d8ef1

IMA Classification of SitinakiteHide

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IMA Formula:

KNa2Ti4Si2O13(OH) · 4H2O

Type description reference:

Men´shikov, Y. P., Sokolova, E. V., Egorov-Tismenko, Y. K., Khomyakov, A. P., Polezhaeva, L. I. (1992) Sitinakite Na2KTi4Si2O13(OH)·4H2O - a new mineral. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 121 (1) 94-99

Classification of SitinakiteHide

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9.AG.30

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination

52.4.11.1

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of SitinakiteHide

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Transparency:

Transparent, Translucent

Colour:

Colourless, light-brown to pale rose, pinkish brown

Cleavage:

Perfect
{100} and {001}

Density:

2.86(6) g/cm3 (Measured) 2.89 g/cm3 (Calculated)

Optical Data of SitinakiteHide

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RI values:

_n_ω = 1.780(3) _n_ε = 1.988(3)

δ = 0.208

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of SitinakiteHide

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Mindat Formula:

KNa2Ti4(SiO4)2O5(OH) · 4H2O

Common Impurities:

Ca,Sr,Ba,Ce,Fe,Nb,Ta,Zr,TR

Crystallography of SitinakiteHide

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Crystal System:

Tetragonal

Class (H-M):

4/m m m _(_4/_m_2/_m_2/m ) - Ditetragonal Dipyramidal

Cell Parameters:

a = 7.819(2) Å, c = 12.099(4) Å

Unit Cell V:

739.69 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of SitinakiteHide

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General Appearance of Type Material:

Equant and short prismatic crystals, 1 x 1 x 2 mm, and in 3-4 mm patches of intergrown crystals.

Place of Conservation of Type Material:

Geology Museum, Kola Branch, Academy of Sciences, Apatity, Mining Institute, St. Petersburg, Russia, 2021/1; The Natural History Museum, London, England, 1994,31.

Geological Setting of Type Material:

In hydrothermal natrolite nodules in alkalic pegmatites.

Associated Minerals at Type Locality:

Reference:

Men´shikov, Y.P., Sokolova, E.V., Egorov-Tismenko, Y.K., Khomyakov, A.P., Polezhaeva, L.I. (1992) Sitinakite Na2KTi4Si2O13(OH)·4H2O - a new mineral. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 121(1), 94-99.

Synonyms of SitinakiteHide

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Other Language Names for SitinakiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of SitinakiteHide

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Other InformationHide

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Notes:

No dissolution observed in H2O, HCl, or HNO3 at room temperature.

Health Risks:

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

Internet Links for SitinakiteHide

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References for SitinakiteHide

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Reference List:

Panikorovskii, T.L. , Yakovenchuk, V.N., Kalashnikova, G.O., Bazai, A.V., Ikkonen, P., Yanicheva N.Yu., Krivovichev, S.V. (2023): Microporous sorbents for Th4+, REE3+, Cs+. Trudy Fersmanovskoy nauchnoy sessii GI KNTS RAN, 20, 632-638.

Sokolova, E.V., Rastsvetaeva, R.K., Andrianov, V.I., Egorov-Tismenko, Y.K., Men'shikov, Y.P. (1989) The crystal structure of a new sodium titanosilicate. Soviet Physics - Doklady, 34, 583-585.

Men´shikov, Y. P., Sokolova, E. V., Egorov-Tismenko, Y. K., Khomyakov, A. P., Polezhaeva, L. I. (1992) Sitinakite Na2KTi4Si2O13(OH)·4H2O - a new mineral. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 121 (1) 94-99

Thorogood, G.J., Kennedy, B.J., Griffith, C.S., Elcombe, M.M., Avdeev, M., Hanna, J.V., Thorogood, S.K., Luca, V. (2010) Structure and Phase Transformations in the Titanosilicate, Sitinakite. The Importance of Water. Chemistry of Materials, 22, 4222–4231.

Panikorovskii, T.L., Kalashnikova, G.O., Nikolaev, A.I., Perovskiy, I.A., Bazai, A.V., Yakovenchuk, V.N., Bocharov, V.N., Kabanova, N.A., Krivovichev, S.V. (2022) Ion-Exchange-Induced Transformation and Mechanism of Cooperative Crystal Chemical Adaptation in Sitinakite: Theoretical and Experimental Study. Minerals, 12(2), 248. https://doi.org/10.3390/min12020248

Localities for SitinakiteHide

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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

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