General Niobokupletskite Information
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Chemical Formula: |
K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) |
Composition: |
Molecular Weight = 1,377.37 gm |
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Potassium 5.68 % K 6.84 % K2O |
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Sodium 2.34 % Na 3.15 % Na2O |
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Zirconium 2.65 % Zr 3.58 % ZrO2 |
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Titanium 1.04 % Ti 1.74 % TiO2 |
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Manganese 21.54 % Mn 27.81 % MnO |
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Niobium 8.77 % Nb 12.54 % Nb2O5 |
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Zinc 3.32 % Zn 4.14 % ZnO |
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Iron 2.03 % Fe 2.61 % FeO |
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Silicon 16.31 % Si 34.90 % SiO2 |
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Hydrogen 0.29 % H 2.62 % H2O |
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Oxygen 35.89 % O |
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Fluorine 0.14 % F 0.14 % F |
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- % F -0.06 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
K2Na1.4Mn2+5.4Zn0.7Fe2+0.5Nb1.3Zr0.4Ti0.3Si8O26.9(OH)4F0.1 |
Environment: |
Nepheline syenite pegmatite at the Poudrette quarry. Epitaxially overgrown on kupletskite. Astrophyllite group |
IMA Status: |
Approved IMA 1999 (Dana # Added) |
Locality: |
Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data. |
Name Origin: |
Named as the Nb analog of kupletskite. |
Synonym: |
ICSD 89859 |
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IMA1999-032 |
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Niobokupletskite Image |
Images:
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Niobokupletskite Kupletskite
Comments: Back-scattered electron image of Niobokupletskite (Nkpt) rimming kupletskite (Kpt). The zoning in the kupletskite is from Nb-poor to Nb-rich in the direction of the arrow (dark to medium gray). (CanMin v 38, p 628).
Location: Mont Saint-Hilaire, Quebec, Canada.
Scale: Scale bar 100 µ-m.
© Canadian Mineralogist |
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Niobokupletskite Crystallography
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Axial Ratios: |
a:b:c =0.4554:1:0.9851 |
Cell Dimensions: |
a = 5.4303, b = 11.924, c = 11.747, Z = 1; alpha = 112.927°, beta = 94.75°, gamma = 103.175° V = 679.76 Den(Calc)= 3.36 |
Crystal System: |
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1 |
X Ray Diffraction: |
By Intensity(I/Io): 10.707(1)(001), 3.536(0.5)(003), 2.587(0.4)(130),2.793(0.4)(131), 2.677(0.3)(211), 2.503(0.2)(212), 3.2 |
Crystal Structure:
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Piilonen P C , Lalonde A E , McDonald A M , Gault R A , The Canadian Mineralogist , 38 (2000) p.627-639, Niobokupletskite, a new astrophyllite-group mineral from Mont Saint-Hilaire,, Quebec, Canada: Description and crystal structure, Locality: Mont Saint-Hilaire, Quebec, Canada
View Additional jPOWD Structure files for Niobokupletskite
[1]
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Physical Properties of Niobokupletskite
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Cleavage: |
[001] Perfect |
Color: |
Beige, Brown. |
Density: |
3.325 |
Diaphaniety: |
Transparent |
Fracture: |
Brittle - Splintery - Brittle fracture leaving splintery fragments. |
Habit: |
Platy - Sheet forms (e.g. micas). |
Habit: |
Tabular - Form dimensions are thin in one direction. |
Hardness: |
3-4 - Calcite-Fluorite |
Luster: |
Vitreous (Glassy) |
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Optical Properties of Niobokupletskite
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Gladstone-Dale: |
CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2184,KPDmeas= 0.2207,KC= 0.2152 |
Optical Data: |
Biaxial (+), a=1.718, b=1.733, g=1.75, bire=0.0320 |
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Calculated Properties of Niobokupletskite
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Electron Density: |
relectron=3.23 gm/cc note: rNiobokupletskite =3.36 gm/cc. |
Fermion Index |
Fermion Index = 0.01391 Boson Index = 0.98609 |
Photoelectric: |
PENiobokupletskite = 25.66 barns/electron U=PENiobokupletskite x relectron= 82.93 barns/cc. |
Radioactivity: |
GRapi = 78.78 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Niobokupletskite - barely detectable
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Niobokupletskite Classification
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Dana Class: |
69.1.1.8 (69)Inosilicate Chains with Side Branches or Loops |
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(69.1)with (P=2, and N=4, 2 branches) |
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(69.1.1)Astrophyllite group |
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69.1.1.1 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1 |
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69.1.1.2 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m |
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69.1.1.3 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1 |
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69.1.1.4 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri |
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69.1.1.5 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1 |
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69.1.1.6 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1 |
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69.1.1.7 Magnesiumastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m |
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69.1.1.8 Niobokupletskite ! K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1 |
Strunz Class: |
VIII/G.12-65 VIII - Silicates |
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VIII/G - Intermediate between chain- and layered silicates |
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VIII/G.12 - Astrophyllite- Kupletskite group |
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VIII/G.12-20 Magnesiumastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m |
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VIII/G.12-30 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1 |
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VIII/G.12-40 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1 |
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VIII/G.12-50 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m |
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VIII/G.12-60 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1 |
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VIII/G.12-65 Niobokupletskite K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1 |
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VIII/G.12-70 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1 |
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VIII/G.12-80 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri |
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Other Niobokupletskite Information
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References: |
NAME( AmMin, Vol 86) PHYS. PROP.(AmMin, Vol 86) OPTIC PROP.(AmMin, Vol 86) |
See Also: |
Links to other databases for Niobokupletskite :
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
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Niobokupletskite
K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F)
Dana No: 69.1.1.8 Strunz No: VIII/G.12-65
Locality:
Notes:
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