Taseqite Mineral Data

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General Taseqite Information

Chemical Formula:

Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2

Composition:

Molecular Weight = 3,403.45 gm

Potassium 0.20 % K 0.24 % K₂O

Sodium 5.95 % Na 8.02 % Na₂O

Strontium 12.31 % Sr 14.55 % SrO

Calcium 6.09 % Ca 8.52 % CaO

Cerium 0.08 % Ce 0.10 % Ce₂O₃

Yttrium 0.24 % Y 0.30 % Y₂O₃

Hafnium 0.26 % Hf 0.31 % HfO₂

Zirconium 7.61 % Zr 10.28 % ZrO₂

Tantalum 0.21 % Ta 0.26 % Ta₂O₅

Manganese 2.44 % Mn 3.15 % MnO

Niobium 3.19 % Nb 4.57 % Nb₂O₅

Iron 3.17 % Fe 4.07 % FeO

Silicon 20.26 % Si 43.34 % SiO₂

Tin 0.10 % Sn 0.13 % SnO₂

Hydrogen 0.07 % H 0.61 % H₂O

Chlorine 1.99 % Cl 1.99 % Cl

- % Cl -0.45 % -O=Cl₂

Oxygen 35.84 % O

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

Na_8.81Sr_4.78K_0.17Ce_0.02Ca_5.17Mn²⁺_0.59Y_0.09Fe²⁺_1.93Mn²⁺_0.92Zr_2.84Nb_0.11Hf_0.05Nb_1.06 Ta_0.04Sn_0.03Si_24.55O_74.65(OH)_0.75(OH)_0.09

Environment:

Occurs in a cavity in a late-stage hydrothermal albitite vein in the Ilímaussaq alkaline complex. (Eudialyte group, predominance of Sr in N(4) and Nb in M(3); structure determined).

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Ilímaussaq alkaline complex, South Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for the northern part of the complex, at theTaseq slope.

Synonym:

IMA2002-055

Taseqite Image

Images:

Taseqite

Comments: Crystalline magenta-colored taseqite in matrix.
Location: Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 0.3 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Taseqite Crystallography

Axial Ratios:

a:c = 1:2.09925

Cell Dimensions:

a = 14.286, c = 29.99, Z = 3; V = 5,300.64 Den(Calc)= 3.20

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.86(1)(404), 2.98(1)(315), 3.43(0.9)(131,223),9.51(0.9)(012), 3.19(0.8)(208), 11.49(0.5)(101),

Crystal Structure:

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Petersen O V , Johnsen O , Gault R A , Niedermayr G , Grice J D , Neues Jahrbuch fur Mineralogie, Monatshefte , 2004 (2004) p.83-96, Taseqite, a new member of the eudialyte group from the Ilímaussaq alkaline complex, South Greenland, Locality: Ilimaussaq alkaline complex, South Greenland, Note: water and OHs located at O20 and O21

Physical Properties of Taseqite

Cleavage:

{001} Fair

Color:

Clove brown, Yellowish brown, Lemon yellow.

Density:

3.24

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Luster:

Vitreous (Glassy)

Streak:

light brownish white

Optical Properties of Taseqite

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2011,KPDmeas= 0.1986,KC= 0.2026
Ncalc = 1.65 - 1.66

Optical Data:

Uniaxial (-), e=1.6378, w=1.6494, bire=0.0116.

Calculated Properties of Taseqite

Electron Density:

Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Taseqite =3.20 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Taseqite= 37.74 barns/electron
U=PE_Taseqite x r_electron= 116.08 barns/cc.

Radioactivity:

GRapi = 87.15 (Gamma Ray American Petroleum Institute Units)
Concentration of Taseqite per GRapi unit = 1.15 (%)

Estimated Radioactivity from Taseqite - barely detectable

Taseqite Classification

Dana Class:

64.01.01.11 (64)Cyclosilicates

(64.01)Cyclosilicate Rings with Other Anions and Insular Silicate Groups with mixed ring types

(64.01.01)Eudialyte Group

64.01.01.01 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m

64.01.01.02 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl•2(H2O) R 3m 3 2/m

64.01.01.03 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2•2(H2O) R 3m 3m

64.01.01.04 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

64.01.01.05 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

64.01.01.06 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3

64.01.01.07 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m

64.01.01.08 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl•2-3H2O R 3m 3m

64.01.01.09 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m

64.01.01.10 Rastsvetaevite! Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 R 3m 3m

64.01.01.11 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m

64.01.01.12 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O R 3m 3m

64.01.01.13 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O R 3m 3m

64.01.01.14 Labyrinthite! (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 R 3m 3m

64.01.01.15 Aqualite! (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl R 3m 3m

64.01.01.16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m

64.01.01.17 Georgbarsanovite! Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2•H2O R 3m 3m

64.01.01.18 Johnsenite-(Ce)! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2 R 3m 3m

64.01.01.19 Golyshevite! (Na,Ca)10Ca9(Fe,Fe)2Zr3NbSi25O72(CO3)(OH)3•H2O R 3m 3m

64.01.01.20 Mogovidite! Na9(Ca,Na)6Ca6Fe2Zr3[]Si25O72(CO3)(OH)4 R 3m 3m

64.01.01.21 Dualite! Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3MnSi51O144(OH,H2O,Cl)9 R 3m 3m

64.01.01.22 Voronkovite! Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl•H2O R 3 3

Strunz Class:

09.CO.10 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CO -[Si9O27]18- 9-membered rings

09.CO.10 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl•2(H2O) R 3m 3 2/m

09.CO.10 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m

09.CO.10 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2•2(H2O) R 3m 3m

09.CO.10 Labyrinthite! (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 R 3m 3m

09.CO.10 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O R 3m 3m

09.CO.10 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)•H2O R 3m 3m

09.CO.10 Mogovidite! Na9(Ca,Na)6Ca6Fe2Zr3[]Si25O72(CO3)(OH)4 R 3m 3m

09.CO.10 Voronkovite! Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl•H2O R 3 3

09.CO.10 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m

09.CO.10 Aqualite! (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl R 3m 3m

09.CO.10 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m

09.CO.10 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m

09.CO.10 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl•2-3H2O R 3m 3m

09.CO.10 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

09.CO.10 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

09.CO.10 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3

09.CO.10 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m

09.CO.10 Rastsvetaevite! Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 R 3m 3m

09.CO.10 Johnsenite-(Ce)! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2 R 3m 3m

09.CO.10 Georgbarsanovite! Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2•H2O R 3m 3m

09.CO.10 Golyshevite! (Na,Ca)10Ca9(Fe,Fe)2Zr3NbSi25O72(CO3)(OH)3•H2O R 3m 3m

09.CO.10 Dualite! Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3MnSi51O144(OH,H2O,Cl)9 R 3m 3m

Other Taseqite Information

References:

NAME( AmMin, 89:1831) PHYS. PROP.(AmMin, 89:1831) OPTIC PROP.(AmMin, 89:1831)

See Also:

Links to other databases for Taseqite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Taseqite

Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2
Dana No: 64.01.01.11 Strunz No: 09.CO.10
Locality:

Notes: