Taseqite Mineral Data

Taseqite Mineral Data

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

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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),

Physical Properties of Taseqite

Cleavage:

[001] Fair

Color:

Clove brown, Yellowish brown, Lemon yellow.

Density:

3.24

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Taseqite

Electron Density:

r_electron=3.08 gm/cc
note: r_Taseqite=3.20 gm/cc.

Fermion Index

Fermion Index = 0.02856
Boson Index = 0.97144

Photoelectric:

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

Radioactivity:

GRapi = 87.10 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Taseqite - barely detectable

Taseqite Classification

Dana Class:

64.1.1.11 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups

(64.1)with mixed ring types

(64.1.1)Eudialyte Group

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

64.1.1.17 Georgbarsanovite! Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2·H2O R 3m 3m

64.1.1.18 IMA2004-026! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(OH)3(CO3)·H2O R 3m 3m

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

Strunz Class:

VIII/E.25-58 VIII - Silicates

VIII/E - Cyklosilicates, triplet rings, nine-rings and ten-rings

VIII/E.25 - Eudialyte - Alluaivite series

VIII/E.25-10 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m

VIII/E.25-14 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·2-3H2O R 3m 3m

VIII/E.25-16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m

VIII/E.25-20 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m

VIII/E.25-30 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2·2(H2O) R 3m 3m

VIII/E.25-32 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m

VIII/E.25-40 Oneillite! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3

VIII/E.25-50 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m

VIII/E.25-56 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m

VIII/E.25-58 Taseqite Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m

VIII/E.25-60 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

VIII/E.25-70 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m

VIII/E.25-80 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl·2(H2O) R 3m 3 2/m

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Taseqite

Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2
Dana No: 64.1.1.11 Strunz No: VIII/E.25-58
Locality:

Notes: