Tadzhikite-(Ce) (original) (raw)

A valid IMA mineral species

About Tadzhikite-(Ce)Hide

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Formula:

Ca4Ce3+2Ti◻2(B4Si4O22)(OH)2

Specific Gravity:

3.73 - 3.86

Crystal System:

Monoclinic

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. The name is from an alternate spelling for the Republic of Tajikistan, and the suffix indicates the dominant REE.

Specimens of tadzhikite-(Ce) from the type locality have earlier erroneously been labelled as tadzhikite-(Y). The mineral, which originally was named as tadzhikite (without the suffix), 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-II", 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 IdentifiersHide

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Long-form identifier:

mindat:1:1:3866:5

57f46c7d-7cd2-4ae2-98ce-12a6d10011e9

IMA Classification of Tadzhikite-(Ce)Hide

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IMA status notes:

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)

Type description 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.

Classification of Tadzhikite-(Ce)Hide

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9.DK.20

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

17.5.19

17 : Silicates Containing other Anions
5 : Borosilicates

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 Tadzhikite-(Ce)Hide

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Transparency:

Translucent, Opaque

Density:

3.73 - 3.86 g/cm3 (Measured) 3.77 g/cm3 (Calculated)

Optical Data of Tadzhikite-(Ce)Hide

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RI values:

_n_α = 1.750 - 1.761 _n_β = 1.767 _n_γ = 1.763 - 1.772

δ = 0.013

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

Dispersion:

distinct to strong

Chemistry of Tadzhikite-(Ce)Hide

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Mindat Formula:

Ca4Ce3+2Ti◻2(B4Si4O22)(OH)2

Crystallography of Tadzhikite-(Ce)Hide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 18.946(4) Å, b = 4.714(4) Å, c = 10.302(2) Å
β = 11.58(2)°

Ratio:

a:b:c = 4.019 : 1 : 2.185

Unit Cell V:

184.69 ų (Calculated from Unit Cell)

Crystal StructureHide

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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 DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of Tadzhikite-(Ce)Hide

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General Appearance of Type Material:

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)Hide

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Other Language Names for Tadzhikite-(Ce)Hide

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Simplified Chinese:塔吉克石

Traditional Chinese:塔吉克石

Relationship of Tadzhikite-(Ce) to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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)Hide

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References for Tadzhikite-(Ce)Hide

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Reference List:

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.

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.

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.

Oberti, Roberta, Ventura, Giancarlo Della, Ottolini, Luisa, Hawthorne, Frank C., Bonazzi, Paola (2002) Re-definition, nomenclature and crystal-chemistry of the hellandite group. American Mineralogist, 87 (5) 745-752 doi:10.2138/am-2002-5-618

Localities for Tadzhikite-(Ce)Hide

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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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- 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.