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Flag of Tajikistan
Brown, grey
Crystal System:
Named by A.F. Efimov, V.D. Dusmatov, V.Y. Alkhazov, Z.G. Pudovkina, and M.Y. Kazakova in 1970 for the country of the type locality. They name is formed from an alternate spelling for the Republic of Tajikistan, and the suffix indicates the dominant REE.
Specimens of tadzhikite-(Ce) from the typelocality has earlier erronously been labelled as tadzhikite-(Y). The mineral which originally was named as tadzhikite (without the prefix), was described by Efimov et al. (1970) as two varieties: "tadzhikikite-I" and "tadzhikite-II". The "tadzhikite-I" is enriched in Y relative to "tadzhikite-Il", and was thus informally named as tadzhikite-(Y) by Pekov (1988). However, structural analysis has established that the mineral is in fact Ce-dominant (Hawthorne et al., 1988); Oberti et al., 2002).

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Classification of Tadzhikite-(Ce)Hide

Renamed by the IMA
Approval History:
Approved by IMA in 1969 as tadzhikite.
Tadzhikite was renamed as tadzhikite-(Ce) by IMA in 2000 (special procedure 00-F)

9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains

17 : Silicates Containing other Anions
5 : Borosilicates

Physical Properties of Tadzhikite-(Ce)Hide

Brown, grey

Optical Data of Tadzhikite-(Ce)Hide

Biaxial (+/-)
RI values:
nα = 1.750 - 1.761 nγ = 1.763 - 1.772
Measured: 80° to 92°
Max Birefringence:
δ = 0.013
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
distinct to strong

Chemical Properties of Tadzhikite-(Ce)Hide

IMA Formula:

Crystallography of Tadzhikite-(Ce)Hide

Crystal System:

Type Occurrence of Tadzhikite-(Ce)Hide

Synonyms of Tadzhikite-(Ce)Hide

Other Language Names for Tadzhikite-(Ce)Hide

Simplified Chinese:塔吉克石
Traditional Chinese:塔吉克石

Relationship of Tadzhikite-(Ce) to other SpeciesHide

Other Members of this group:
Hellandite-(Ce)(Ca,REE)4Ce2Al□2(B4Si4O22) (OH)2
Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Datolite1 photo of Tadzhikite-(Ce) associated with Datolite on
Fluorite1 photo of Tadzhikite-(Ce) associated with Fluorite on
Sanidine1 photo of Tadzhikite-(Ce) associated with Sanidine on

Related Minerals - Nickel-Strunz GroupingHide

9.DK.05BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)Tric. 1 : P1
9.DK.05MarsturiteNaCaMn3Si5O14(OH)Tric. 1 : P1
9.DK.05RhodoniteCaMn3Mn(Si5O15)Tric. 1
9.DK.10SantaclaraiteCaMn4[Si5O14OH](OH) · H2OTric.
9.DK.20Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.
9.DK.20Hellandite-(Ce)(Ca,REE)4Ce2Al□2(B4Si4O22) (OH)2

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.5.3SearlesiteNa(H2BSi2O7)Mon. 2 : P21
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.10DatoliteCa(HBSiO5)Mon. 2/m : P21/b
17.5.11DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
17.5.12HowliteCa2B5SiO9(OH)5Mon. 2/m : P21/b
17.5.13BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
17.5.14OyeliteCa10Si8B2O29 · 12.5H2OOrth.
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2OTrig. 3m (3 2/m) : R3m
17.5.17SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.28 FerridraviteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
17.5.30Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11Hex. 6/m : P6/m
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2ClxOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
17.5.44SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.45Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.

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 Tadzhikite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Efimov, A.F., Dusmatov, V.D., Alkhazov, V.Y., Pudovkina, Z.G., Kazakova, M.Y. (1970) Tadzhikite, a new borosilicate of the rare earths of the hellandite group. Doklady Akademii Nauk SSSR: 195: 1190-1193.
Doklady Akademii Nauk SSSR, Earth Science Sections: 195: 136-139.
Transactions (Doklady) of the USSR Academy of Sciences, Earth Science Sections (1970): 195: 136.
Fleischer, M. (1971) New mineral names. American Mineralogist: 56: 1838-1840.
Chernitsova, N.M., Pudovkina, Z.V., Pyatenko, Y.A. (1982) About the crystal structure of tadzhikite {(Ca,Tr)4(Y,Tr)2(Ti,Fe,Al)(O,OH)2[Si4B4O22]}. Soviet Physics - Doklady: 27: 367-368.
Nickel, E.H., Mandarino, J.A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature. American Mineralogist: 72: 1031-1042.
Hawthorne, F.C., Cooper, M.A., Taylor, M.C. (1998) Refinement of the crystal structure of tadzhikite. The Canadian Mineralogist: 36: 817-822.
Reguir, E.P., Chakhmouradian, A.R., Evdokimov, M.D. (1999) The mineralogy of a unique baratovite- and miserite-bearing quartz-albite-aegirine rock from the Dara-i-Pioz Complex, northern Tajikistan. Canadian Mineralogist: 37: 1369.
Oberti, R., Ottolini, L., Camara, F., Ventura, G.D. (1999) Crystal structure of non-metamict Th-rich hellandite-(Ce) from Latium (Italy) and crystal chemistry of the hellandite-group minerals. American Mineralogist: 84: 913-921.
Oberti, R., Della Ventura, G., Ottolini, L., Hawthorne, F.C., Bonazzi, P. (2002) Re-definition, nomenclature, and crystal-chemistry of the hellandite group. American Mineralogist: 87: 745-752.
Grew, E.S., Anovitz, L.M. (2002) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised.
Grice, J.D., Ferraris, G. (2003) New minerals approved in 2002 and nomenclature modifications approved in 1998-2002 by the Commission on the New Minerals and Mineral Names, International Mineralogical Association. The Canadian Mineralogist: 41: 795-802.

Internet Links for Tadzhikite-(Ce)Hide

Localities for Tadzhikite-(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.
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
A. McDonald & L. Horvath pers. comm.
  • Latium
    • Viterbo Province
      • Vico Lake
        • Vetralla
BERNABE' E. (1987), Probabile tadzhikite sui Monti Cimini. Notiziario di mineralogia e paleontologia, 51, 20-22. and CIPRIANIITE, MOTTANAITE-(Ce) E HELLANDITE-(Ce): tre nuovi minerali scoperti nel Lazio e revisione sistematica del gruppo dell'hellandite. - Gruppo Min. Romano - "IL CERCAPIETRE" N. 1 - 2 - 2002 - Roma
  • Telemark
    • Porsgrunn
      • Langesundsfjorden
Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp
      • Mørje
        • Sagåsen
Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
Larsen, A.O., Åsheim, A. and Gault, R. A. (2005): Minerals of the eudialyte group from the Sagåsen larvikite quarry, Porsgrunn, Norway. Norsk Bergverksmuseum Skrifter 30: 58-62.
  • Vestfold
    • Larvik
      • Langesundsfjorden
        • Barkevik area
Knut Eldjarn collection; Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp
Andersen, F.,Berge, S.A. & Burvald, I. (1996): Die Mineralien des Langesundsfjords und des umgebenden Larvikit-Gebietes, Oslo-Region, Norwegen. MineralienWelt 7(4):21-100
Field collected and identified by Knut Eldjarn
Andersen, F.,Berge, S.A. & Burvald, I. (1996): Die Mineralien des Langesundsfjords und des umgebenden Larvikit-Gebietes, Oslo-Region, Norwegen. MineralienWelt 7(4):21-100
Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
        • Vesle Arøya
Engvoldsen, T., Andersen, F., Berge, S. A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18 (1), 15-71
      • Tvedalen
Peter Andresen collection.
  • Småland
    • Jönköping
      • Gränna
Christian Brand coll.
Tajikistan (TL)
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
Efimov, A. F., Dusmatov, V. D., Alkhazov, V. Y., Pudovkina, Z. G., Kazakova, M. Y. (1970) Tadzhikite, a new borosilicate of the rare earths of the hellandite group. Doklady Akademii Nauk SSSR: 195: 1190-1193; Fleischer M (1971) New mineral names. American Mineralogist 56, 1838-1840; Chernitsova N M, Pudovkina Z V, Pyatenko Y A (1982) About the crystal structure of tadzhikite {(Ca,Tr)4(Y,Tr)2(Ti,Fe,Al)(O,OH)2[Si4B4O22]}. Soviet Physics - Doklady 27, 367-368
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