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Turkestanite

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About TurkestaniteHide

Formula:
(K,◻)(Ca,Na)2ThSi8O20 · nH2O
Colour:
Brown, apple-green
Lustre:
Vitreous, Dull
Hardness:
5½ - 6
Crystal System:
Tetragonal
Member of:
Name:
Named after the discovery locality, along the Turkestan Ridge, Dara-i-Pioz massif, Tien-Shan Mountains, Tadjikistan.
Steacyite Group. The thorium analogue of Arapovite.


Classification of TurkestaniteHide

Approved
Approval Year:
1996
9.CH.10

9 : SILICATES (Germanates)
C : Cyclosilicates
H : [Si4O12]8- 4-membered double rings

Physical Properties of TurkestaniteHide

Vitreous, Dull
Colour:
Brown, apple-green
Hardness:
5½ - 6 on Mohs scale

Optical Data of TurkestaniteHide

Type:
Uniaxial (-)
RI values:
nω = 1.611 nε = 1.606
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of TurkestaniteHide

Formula:
(K,◻)(Ca,Na)2ThSi8O20 · nH2O

Crystallography of TurkestaniteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P4/mcc
Cell Parameters:
a = 7.592 Å, c = 14.824 Å
Ratio:
a:c = 1 : 1.953
Unit Cell V:
854.43 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of TurkestaniteHide

Synonyms of TurkestaniteHide

Other Language Names for TurkestaniteHide

Simplified Chinese:突厥斯坦石
Spanish:Turkestanita
Traditional Chinese:突厥斯坦石

Relationship of Turkestanite to other SpeciesHide

Member of:
Other Members of this group:
Arapovite(K1-xx)(Ca,Na)2U4+Si8O20 (x ~ 0.5)Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
Iraqite-(La)KCa2(La,Ce,Th)Si8O20Tet.
SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Turkestanite associated with AegirineNaFe3+Si2O6
2 photos of Turkestanite associated with QuartzSiO2
1 photo of Turkestanite associated with CalciteCaCO3
1 photo of Turkestanite associated with FluoriteCaF2
1 photo of Turkestanite associated with Arapovite(K1-xx)(Ca,Na)2U4+Si8O20 (x ~ 0.5)
1 photo of Turkestanite associated with AlbiteNa(AlSi3O8)

Related Minerals - Nickel-Strunz GroupingHide

9.CH.05Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
9.CH.05Kapitsaite-(Y)(Ba,K,Pb)4(Y,Ca)2Si8(B,Si)4O28FTric. 1 : P1
9.CH.10Iraqite-(La)KCa2(La,Ce,Th)Si8O20Tet.
9.CH.10SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
9.CH.10Arapovite(K1-xx)(Ca,Na)2U4+Si8O20 (x ~ 0.5)Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc

Other InformationHide

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 TurkestaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
PAUTOV, L.A., AGAKHANOV, A.A., SOKOLOVA, E.V., and KABALOV, Yu.K. (1998) Turkestanite, Th(Ca,Na)2(K1 xGx)Si8O20•nH2O, a new mineral with doubled four members silica rings. Zapiski Vserossiiskogo Mineralogicheskogo Obshchestva, 126(6), 45 54 (in Russian). English abstract: American Mineralogist 83, 1348-1349.
Kabalov, Yu. K., E. V. Sokolova, L. A. Pautov, J. Schneider: Kristallografiya (1998): 43: 632-636.
Neues Jahrbuch für Mineralogie, Monatshefte (1999): 9: 424-432.
Vilalva, F.C.J., and Vlach, S.R.F. (2010): Major- and trace-element composition of REE-rich turkestanite from peralkaline granites of the Morro Redondo Complex, Graciosa Province, south Brazil. Mineralogical Magazine 74(4), 645-658.

Internet Links for TurkestaniteHide

Localities for TurkestaniteHide

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.
Brazil
 
  • Paraná
    • Tijucas do Sul
      • Morro Redondo complex
Vilalva, F.C.J., and Vlach, S.R.F. (2010): Mineralogical Magazine 74(4), 645-658
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
HORVÁTH, L. & HORVÁTH, E. (2012) Turkestanite from Mont Saint-Hilaire. MICRONEWS 46(3), 22-25.
Denmark
 
  • Greenland
    • Kujalleq
      • Narsaq
Soerensen, H. (2001): The Ilimaussaq alkaline complex, South Greenland: status of mineralogical research with new results, Geology of Greenland Survey Bulletin 190, GEUS; Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
Petersen O. V., Johnsen O., Micheelsen, H. I. (1999): Turkestanite from the Ilimaussaq alkaline complex, south Greenland. Neues Jahrbuch für Mineralogie Monatshefte 9, pp. 424-432
Petersen O. V., Johnsen O., Micheelsen, H. I. (1999): Turkestanite from the Ilimaussaq alkaline complex, south Greenland. Neues Jahrbuch für Mineralogie Monatshefte 9, pp. 424-432
Germany
 
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mendig
in the collection of Christof Schäfer
Kyrgyzstan
 
  • Batken Region
Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
  • Osh Region
    • Sokh Valley
      • Upper Khodzhaachkan River
[Zap. Vser. Mineral. Obshchest. 126 (6), 45; Min; Rec 31:204]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Madagascar
 
  • Diana
    • Ambanja
      • Antsirabe
Estrade, G., et al. (2014): REE and HFSE mineralization in peralkaline granites of the Ambohimirahavavy alkaline complex, Ampasindava peninsula, Madagascar. Journal of African Earth Sciences. 94: 141–155
Namibia
 
  • Khomas Region
    • Windhoek Rural
      • Aris
Uwe Kolitsch (single-crystal X-ray diffraction); Blaß, G., Kolitsch, U., Tremmel, G., Esche, J. (2016): Neue Mineralienfunde aus den Phonolithbrüchen von Aris in Namibia. Mineralien-Welt 27 (4), 48-60 (in German).
Portugal
 
  • Azores
    • São Miguel Island
Analysed by Pedro Alves; Lavarde, S., Chiappino, L., Alves, P., Astolfi, M., (2019) Les Minéraux du massif volcanique du Fogo, Ile de São Miguel, Açores, Portugal. Le Règne Mineral, 145, 30-50
Tajikistan (TL)
 
  • Districts of Republican Subordination
Canadian Mineralogist 42:107-119 (2004); Agakhanov A.A., Pautov L.A., Karpenko V.Yu., Bekenova G.K., Uvarova Y.A. (2011) Orlovite, KLi2 TiSi4 O11F, a new mineral of the mica group New Mineral Data 46:13-19; Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Yu., Siidra, O.I., Muftakhov, V.A. (2016): Odigitriaite, CsNa5Ca5[Si14B2O38]F2, a new cesium borosilicate mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure. Mineralogical Magazine, 80, (in press).
 
Mineral and/or Locality  
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