Tadzhikite-(Ce)
A valid IMA mineral species
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About Tadzhikite-(Ce)
Formula:
Ca4Ce3+2Ti◻2(B4Si4O22)(OH)2
Colour:
Brown, grey
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
3.73 - 3.86
Crystal System:
Monoclinic
Member of:
Name:
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).
Unique Identifiers
Mindat ID:
3866
Long-form identifier:
mindat:1:1:3866:5
GUID
(UUID V4):
(UUID V4):
57f46c7d-7cd2-4ae2-98ce-12a6d10011e9
IMA Classification of Tadzhikite-(Ce)
Approved
IMA status notes:
Renamed by the IMA
IMA Formula:
Approval history:
Approved by IMA in 1969 as tadzhikite.
Tadzhikite was renamed as tadzhikite-(Ce) by IMA in 2000 (special procedure 00-F)
Tadzhikite was renamed as tadzhikite-(Ce) by IMA in 2000 (special procedure 00-F)
Classification of Tadzhikite-(Ce)
9.DK.20
9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains
9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains
17.5.19
17 : Silicates Containing other Anions
5 : Borosilicates
17 : Silicates Containing other Anions
5 : Borosilicates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Tad-Ce | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Tadzhikite-(Ce)
Vitreous
Transparency:
Translucent, Opaque
Colour:
Brown, grey
Streak:
White
Hardness:
6 on Mohs scale
Parting:
Parting on {010}
Density:
3.73 - 3.86 g/cm3 (Measured) 3.77 g/cm3 (Calculated)
Optical Data of Tadzhikite-(Ce)
Type:
Biaxial (+/-)
RI values:
nα = 1.750 - 1.761 nβ = 1.767 nγ = 1.763 - 1.772
2V:
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.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
distinct to strong
Chemistry of Tadzhikite-(Ce)
Mindat Formula:
Ca4Ce3+2Ti◻2(B4Si4O22)(OH)2
Crystallography of Tadzhikite-(Ce)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 18.946(4) Å, b = 4.714(4) Å, c = 10.302(2) Å
β = 11.58(2)°
β = 11.58(2)°
Ratio:
a:b:c = 4.019 : 1 : 2.185
Unit Cell V:
184.69 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005547 | Tadzhikite-(Ce) | Hawthorne F C, Cooper M A, Taylor M C (1998) Refinement of the crystal structure of tadzhikite The Canadian Mineralogist 36 817-822 | 1998 | Dara-i-Pioz, Tadzhikistan | 0 | 293 | |
0015611 | Tadzhikite-(Ce) | 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 | 1982 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.65 Å | (100) |
1.913 Å | (55) |
4.96 Å | (30) |
2.94 Å | (30) |
1.665 Å | (30) |
2.86 Å | (25) |
2.19 Å | (25) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Tadzhikite-(Ce)
General Appearance of Type Material:
prismatic crystals
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 73374, 74575, 74965, vis3328.
Associated Minerals at Type Locality:
Reference:
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.
Synonyms of Tadzhikite-(Ce)
Other Language Names for Tadzhikite-(Ce)
Relationship of Tadzhikite-(Ce) to other Species
Member of:
Other Members of this group:
Ciprianiite | Ca4[(Th,U),Ca]Σ2Al(Be0.5◻1.5)Σ2[B4Si4O22](OH)2 | Mon. 2/m : P2/b |
Ferri-hellandite-(Ce) | (Ca3Ce)Ce2Fe3+◻2B4Si4O22(OH)2 | Mon. 2/m : P2/b |
Ferri-mottanaite-(Ce) | Ca4Ce2Fe3+(Be1.5◻0.5)[Si4B4O22]O2 | Mon. 2/m : P2/b |
Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 | Mon. 2/m |
Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 | Mon. 2/m : P2/b |
Mottanaite-(Ce) | Ca4(Ce,REE)Σ2Al(Be1.5◻0.5)Σ2[B4Si4O22]O2 | Mon. 2/m |
Common Associates
Associated Minerals Based on Photo Data:
2 photos of Tadzhikite-(Ce) associated with Zirsilite-(Ce) | Na11-12(Ce,Na)3Ca6Mn3Zr3Nb(Si19O55)(Si3O9)2(CO3)(OH)3 · H2O |
1 photo of Tadzhikite-(Ce) associated with Sanidine | K(AlSi3O8) |
1 photo of Tadzhikite-(Ce) associated with Aegirine | NaFe3+Si2O6 |
1 photo of Tadzhikite-(Ce) associated with Microcline | K(AlSi3O8) |
1 photo of Tadzhikite-(Ce) associated with Fluorite | CaF2 |
1 photo of Tadzhikite-(Ce) associated with Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
1 photo of Tadzhikite-(Ce) associated with Hornblende Root Name Group | ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 |
Related Minerals - Strunz-mindat Grouping
9.DK. | Ferrorhodonite | CaMn3Fe[Si5O15] |
9.DK. | Vittinkiite | MnMn3Mn[Si5O15] |
9.DK. | Ferri-hellandite-(Ce) | (Ca3Ce)Ce2Fe3+◻2B4Si4O22(OH)2 |
9.DK. | Shijiangshanite | Pb3CaAl(Si5O14)(OH)3 · 3H2O |
9.DK.05 | Allagite | |
9.DK.05 | Babingtonite | Ca2(Fe,Mn)FeSi5O14(OH) |
9.DK.05 | Lithiomarsturite | LiCaMn3Si5O14(OH) |
9.DK.05 | Manganbabingtonite | Ca2(Mn,Fe)FeSi5O14(OH) |
9.DK.05 | Marsturite | NaCaMn3Si5O14(OH) |
9.DK.05 | Nambulite | LiMn2+4Si5O14(OH) |
9.DK.05 | Natronambulite | (Na,Li)(Mn,Ca)4Si5O14OH |
9.DK.05 | Rhodonite | CaMn3Mn[Si5O15] |
9.DK.05 | Scandiobabingtonite | Ca2(Fe2+,Mn)ScSi5O14(OH) |
9.DK.10 | Santaclaraite | CaMn4[Si5O14OH](OH) · H2O |
9.DK.15 | Saneroite | NaMn2+5[Si5O14(OH)](VO3)(OH) |
9.DK.20 | Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 |
9.DK.20 | Hellandite-(Yb) | (Ca,Y)4(Yb,Y)2(Al,Fe3+,Ti4+)(Be,Li)2[B4Si4O22](O,F,OH)2 |
9.DK.20 | Mottanaite-(Ce) | Ca4(Ce,REE)Σ2Al(Be1.5◻0.5)Σ2[B4Si4O22]O2 |
9.DK.20 | Ciprianiite | Ca4[(Th,U),Ca]Σ2Al(Be0.5◻1.5)Σ2[B4Si4O22](OH)2 |
9.DK.20 | Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
9.DK.20 | Ferri-mottanaite-(Ce) | Ca4Ce2Fe3+(Be1.5◻0.5)[Si4B4O22]O2 |
Other Information
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 Tadzhikite-(Ce)
mindat.org URL:
https://www.mindat.org/min-3866.html
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References for Tadzhikite-(Ce)
Reference List:
Nickel, Ernest H., Mandarino, Joseph A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature. American Mineralogist, 72 (9-10) 1031-1042
Localities for Tadzhikite-(Ce)
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Canada | |
| A. McDonald & L. Horvath pers. comm. +2 other references |
Italy | |
| BERNABE' E. (1987) |
| In the collection of Brent Thorne. ... |
Kyrgyzstan | |
| Pautov et al. (2013) |
Norway | |
| Engvoldsen et al. (1991) |
Larsen et al. (2005) | |
| |
Larsen et al. (2010) | |
| Knut Eldjarn Collection +1 other reference |
Larsen et al. (2010) | |
Andersen et al. (1996) | |
Field collected and identified by Knut ... | |
Knut Eldjarn Collection | |
Andersen et al. (1996) | |
Engvoldsen et al. (1991) | |
| Peter Andresen collection. |
| Engvoldsen et al. (1991) |
Sweden | |
| Christian Brand coll. |
Tajikistan (TL) | |
| Efimov et al. (1970) +2 other references |
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Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan