General Oneillite Information
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Chemical Formula: |
Na15Ca3Mn3Fe++3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 |
Composition: |
Molecular Weight = 3,128.56 gm |
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Sodium 11.02 % Na 14.86 % Na2O |
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Calcium 3.84 % Ca 5.38 % CaO |
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Zirconium 8.75 % Zr 11.82 % ZrO2 |
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Manganese 5.27 % Mn 6.80 % MnO |
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Niobium 2.97 % Nb 4.25 % Nb2O5 |
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Iron 5.36 % Fe 6.89 % FeO |
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Silicon 22.44 % Si 48.01 % SiO2 |
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Hydrogen 0.10 % H 0.89 % H2O |
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Chlorine 0.57 % Cl 0.57 % Cl |
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- % Cl -0.13 % -O=Cl2 |
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Oxygen 39.68 % O |
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______ ______ |
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100.00 % 99.34 % = TOTAL OXIDE |
Empirical Formula: |
Na15Ca3Mn2+3Fe2+3Zr3NbSi25O74.8(OH)2.5(H2O)0.3Cl0.5 |
Environment: |
Found in nepheline syenite at the contact between a vein of fine-grained albite and the host rock. A member of the Eudialyte group. |
IMA Status: |
Approved IMA 1998 (Dana # Added) |
Locality: |
Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data. |
Name Origin: |
Named after John Johnston O’Neill (1886-1966), geologist with the Geological Survey of Canada, Ottawa, and later, Professor of geology, Dean of Science and Dean of Engineering at Mc Gill University, Montreal, Canada. |
Synonym: |
IMA1998-064 |
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Images:
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Oneillite Crystallography
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Axial Ratios: |
a:c = 1:2.11266 |
Cell Dimensions: |
a = 14.192, c = 29.983, Z = 3; V = 5,229.90 Den(Calc)= 2.98 |
Crystal System: |
Trigonal - PyramidalH-M Symbol (3) Space Group: R 3 |
X Ray Diffraction: |
By Intensity(I/Io): 2.964(1), 2.844(0.891), 11.348(0.442),4.291(0.365), 6.021(0.361), 3.15(0.349), 7.1(0.33), 3.199(0.308), 5.683(0.308), |
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Physical Properties of Oneillite
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Cleavage: |
None |
Color: |
Yellowish brown. |
Density: |
3.2 |
Diaphaniety: |
Transparent |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
Hardness: |
5-6 - Between Apatite and Orthoclase |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Oneillite
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Gladstone-Dale: |
CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2157,KPDmeas= 0.2009,KC= 0.2069 |
Optical Data: |
Uniaxial (-), e=1.6406, w=1.645, bire=0.0044. |
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Calculated Properties of Oneillite
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Electron Density: |
relectron=3.11 gm/cc note: rOneillite =3.20 gm/cc. |
Fermion Index |
Fermion Index = 0.02167 Boson Index = 0.97833 |
Photoelectric: |
PEOneillite = 20.39 barns/electron U=PEOneillite x relectron= 63.45 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Oneillite is Not Radioactive |
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Oneillite Classification
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Dana Class: |
64.1.1.6 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups |
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(64.1)with mixed ring types |
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(64.1.1)Eudialyte Group |
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64.1.1.1 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m |
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64.1.1.2 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl·2(H2O) R 3m 3 2/m |
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64.1.1.3 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2·2(H2O) R 3m 3m |
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64.1.1.4 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m |
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64.1.1.5 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m |
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64.1.1.6 Oneillite ! Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3 |
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64.1.1.7 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m |
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64.1.1.8 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·2-3H2O R 3m 3m |
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64.1.1.9 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m |
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64.1.1.10 Rastsvetaevite! Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 R 3m 3m |
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64.1.1.11 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m |
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64.1.1.12 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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64.1.1.13 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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64.1.1.14 Labyrinthite! (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 R 3m 3m |
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64.1.1.15 Aqualite! (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl R 3m 3m |
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64.1.1.16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m |
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64.1.1.17 Georgbarsanovite! Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2·H2O R 3m 3m |
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64.1.1.18 IMA2004-026! Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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64.1.1.19 Mogovidite! Na9(Ca,Na)6Ca6Fe2Zr3[]Si25O72(CO3)(OH)4 R 3m 3m |
Strunz Class: |
VIII/E.25-40 VIII - Silicates |
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VIII/E - Cyklosilicates, triplet rings, nine-rings and ten-rings |
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VIII/E.25 - Eudialyte - Alluaivite series |
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VIII/E.25-10 Eudialyte Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2(?) R 3m 3 2/m |
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VIII/E.25-14 Ikranite! (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·2-3H2O R 3m 3m |
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VIII/E.25-16 Raslakite! Na15Ca3Fe3(Na,Zr)3Zr3(Si,Nb)(Si25O73)(OH,H2O)3(Cl,OH) R 3m 3m |
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VIII/E.25-20 Ferrokentbrooksite! Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 R 3m 3m |
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VIII/E.25-30 Kentbrooksite! (Na,REE)15(Ca,REE)6MnZr3NbSi25O74F2·2(H2O) R 3m 3m |
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VIII/E.25-32 Carbokentbrooksite! (Na,[])12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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VIII/E.25-40 Oneillite Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3 3 |
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VIII/E.25-50 Feklichevite! Na11Ca9(Fe,Fe)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 R 3m 3m |
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VIII/E.25-56 Zirsilite-(Ce)! (Na,[])12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3)·H2O R 3m 3m |
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VIII/E.25-58 Taseqite! Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2 R 3m 3m |
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VIII/E.25-60 Khomyakovite! Na12Sr3Ca6Fe3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m |
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VIII/E.25-70 Manganokhomyakovite! Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2 R 3m 3m |
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VIII/E.25-80 Alluaivite Na19(Ca,Mn)6(Ti,Nb)3(Si3O9)2(Si10O28)2Cl·2(H2O) R 3m 3 2/m |
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Other Oneillite Information
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References: |
NAME( CanMin, 8/99) PHYS. PROP.(CanMin, 10/99) OPTIC PROP.(CanMin, 10/99) |
See Also: |
Links to other databases for Oneillite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info
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Oneillite
Na15Ca3Mn3Fe++3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2
Dana No: 64.1.1.6 Strunz No: VIII/E.25-40
Locality:
Notes:
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