Niobophyllite Mineral Data + Say NIOBOPHYLLITE

General Niobophyllite Information

Help on Chemical  Formula: Chemical Formula: K2Na(Fe++,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O)
Help on Composition: Composition: Molecular Weight = 1,394.28 gm
   Potassium   5.61 %  K     6.76 % K2O
   Sodium      1.65 %  Na    2.22 % Na2O
   Titanium    0.69 %  Ti    1.15 % TiO2
   Manganese   6.90 %  Mn    8.90 % MnO
   Niobium    11.99 %  Nb   17.16 % Nb2O5
   Iron       21.03 %  Fe   27.05 % FeO
   Silicon    16.11 %  Si   34.47 % SiO2
   Hydrogen    0.29 %  H     2.58 % H2O
   Oxygen     34.71 %  O
   Fluorine    1.02 %  F     1.02 % F
                -   %  F    -0.43 % -O=F2
             ______        ______ 
             100.00 %      100.89 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2NaFe2+5.25Mn2+1.75Nb1.8Ti0.2Si8O26.25(OH)4F0.75
Help on Environment: Environment: Flakes in an albite-arfvedsonite paragneiss.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Ten Mile Lake, Seal Lake area, Labrador, NF, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the niobium content and foliated character common to the astrophyllite group.
 

Niobophyllite Image

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Niobophyllite

Comments: Blackish-brown resinous to silky fibrous niobophyllite coatings on quartz.
Location: Seal Lake area, Labrador, Newfoundland, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Niobophyllite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4537:1:0.9814
Help on Cell Dimensions: Cell Dimensions: a = 5.391, b = 11.88, c = 11.66, Z = 1; alpha = 113.1°, beta = 94.5°, gamma = 103.1° V = 666.95 Den(Calc)= 3.47
Help on Crystal System: Crystal System: TriclinicSpace Group: P1,P 1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.506(1), 10.52(0.9), 2.778(0.8),
 

Physical Properties of Niobophyllite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Brown.
Help on Density: Density: 3.42
Help on Diaphaniety: Diaphaniety: Translucent to Opaque
Help on Habit: Habit: Flakes - Flat, thin crystals or aggregates.
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous - Adamantine
 

Optical Properties of Niobophyllite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2167,KPDmeas= 0.2199,KC= 0.2173
Help on Optical Data: Optical Data: Biaxial (-), a=1.724, b=1.76, g=1.772, bire=0.0480, 2V(Calc)=58, 2V(Meas)=60.
 

Calculated Properties of Niobophyllite

Help on Electron Density: Electron Density:

relectron=3.35 gm/cc
note: rNiobophyllite =3.47 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01304
Boson Index = 0.98696
Help on Photoelectric: Photoelectric:

PENiobophyllite = 27.04 barns/electron
U=PENiobophyllite x relectron= 90.48 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 78.01 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Niobophyllite - barely detectable

 

Niobophyllite Classification

Help on  Dana Class: Dana Class: 69.1.1.4 (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
Help on  Strunz Class: Strunz Class: VIII/G.12-80 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 Niobophyllite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Niobophyllite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Print or Cut-and-Paste your Niobophyllite Specimen Label here :

Niobophyllite

K2Na(Fe++,Mn)7(Nb,Ti)2Si8O26(OH)4(F,O)
Dana No: 69.1.1.4 Strunz No: VIII/G.12-80
Locality:

 

Notes:

 

 
   
 
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