Niobokupletskite Mineral Data

Niobokupletskite Mineral Data

General Niobokupletskite Information

Chemical Formula:

K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F)

Composition:

Molecular Weight = 1,377.37 gm

Potassium 5.68 % K 6.84 % K₂O

Sodium 2.34 % Na 3.15 % Na₂O

Zirconium 2.65 % Zr 3.58 % ZrO₂

Titanium 1.04 % Ti 1.74 % TiO₂

Manganese 21.54 % Mn 27.81 % MnO

Niobium 8.77 % Nb 12.54 % Nb₂O₅

Zinc 3.32 % Zn 4.14 % ZnO

Iron 2.03 % Fe 2.61 % FeO

Silicon 16.31 % Si 34.90 % SiO₂

Hydrogen 0.29 % H 2.62 % H₂O

Oxygen 35.89 % O

Fluorine 0.14 % F 0.14 % F

- % F -0.06 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Na_1.4Mn²⁺_5.4Zn_0.7Fe²⁺_0.5Nb_1.3Zr_0.4Ti_0.3Si₈O_26.9(OH)₄F_0.1

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

IMA1999-032

Niobokupletskite Image

Images:

Click Here for Larger Niobokupletskite Image

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

Niobokupletskite Crystallography

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

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

By Intensity(I/I_o): 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]

Physical Properties of Niobokupletskite

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)

Optical Properties of Niobokupletskite

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

Calculated Properties of Niobokupletskite

Electron Density:

r_electron=3.23 gm/cc
note: r_{Niobokupletskite}=3.36 gm/cc.

Fermion Index

Fermion Index = 0.01391
Boson Index = 0.98609

Photoelectric:

PE_{Niobokupletskite}= 25.66 barns/electron
U=PE_{Niobokupletskite} x r_electron= 82.93 barns/cc.

Radioactivity:

GRapi = 78.78 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Niobokupletskite - barely detectable

Niobokupletskite Classification

Dana Class:

69.1.1.8 (69)Inosilicate Chains with Side Branches or Loops

(69.1)with (P=2, and N=4, 2 branches)

(69.1.1)Astrophyllite group

69.1.1.1 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1

69.1.1.2 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m

69.1.1.3 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1

69.1.1.4 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri

69.1.1.5 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1

69.1.1.6 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1

69.1.1.7 Magnesiumastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m

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

VIII/G - Intermediate between chain- and layered silicates

VIII/G.12 - Astrophyllite- Kupletskite group

VIII/G.12-20 Magnesiumastrophyllite K2Na[Na(Fe,Fe,Mn)Mg2]Ti2Si8O26(OH)4F A2/m 2/m

VIII/G.12-30 Hydroastrophyllite (H3O,K)2Ca(Fe,Mn)5-6Ti2Si8O26(OH)4F P1 1

VIII/G.12-40 Astrophyllite K2Na(Fe,Mn)7Ti2Si8O26(OH)4 P1 1

VIII/G.12-50 Kupletskite K2Na(Mn,Fe)7(Ti,Nb)2Si8O26(OH)4F C 2/c 2/m

VIII/G.12-60 Kupletskite-(Cs) (Cs,K)2Na(Mn,Fe,Li)7(Ti,Nb)2Si8O26(OH)4F P1 1

VIII/G.12-65 Niobokupletskite K2Na(Mn,Zn,Fe)7(Nb,Zr,Ti)2Si8O26(OH)4(O,F) P1 1

VIII/G.12-70 Zircophyllite K2(Na,Ca)(Mn,Fe)7(Zr,Nb)2Si8O26(OH)4F P1 1

VIII/G.12-80 Niobophyllite K2Na(Fe,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O) P1,P 1 Tri

Other Niobokupletskite Information

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: