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 % K2 O
Sodium 5.95 % Na 8.02 % Na2 O
Strontium 12.31 % Sr 14.55 % SrO
Calcium 6.09 % Ca 8.52 % CaO
Cerium 0.08 % Ce 0.10 % Ce2 O3
Yttrium 0.24 % Y 0.30 % Y2 O3
Hafnium 0.26 % Hf 0.31 % HfO2
Zirconium 7.61 % Zr 10.28 % ZrO2
Tantalum 0.21 % Ta 0.26 % Ta2 O5
Manganese 2.44 % Mn 3.15 % MnO
Niobium 3.19 % Nb 4.57 % Nb2 O5
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 % H2 O
Chlorine 1.99 % Cl 1.99 % Cl
- %
Cl -0.45 % -O=Cl2
Oxygen 35.84 % O
______ ______
100.00 % 99.99 % = TOTAL OXIDE
Empirical Formula:
Na8.81 Sr4.78 K0.17 Ce0.02 Ca5.17 Mn2+ 0.59 Y0.09 Fe2+ 1.93 Mn2+ 0.92 Zr2.84 Nb0.11 Hf0.05 Nb1.06
Ta0.04 Sn0.03 Si24.55 O74.65 (OH)0.75 (OH)0.09
Environment:
Occurs in a cavity in a late-stage hydrothermal albitite vein in the Il�maussaq 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:
Il�maussaq 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 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 Pyramidal H-M Symbol (3m) Space Group: R 3m
X Ray Diffraction:
By Intensity(I/Io ): 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
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:
PETaseqite = 37.74 barns/electronU=PETaseqite 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 3 m 3 2/m
64.01.01.02 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl•2(H2O) R 3 m 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 3 m 3 2/m
09.CO.10 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3 m 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:
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