Irtyshite Mineral Data + Say IRTYSHITE

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General Irtyshite Information

Help on Chemical  Formula: Chemical Formula: Na2(Ta,Nb)4O11
Help on Composition: Composition: Molecular Weight = 901.74 gm
   Sodium     5.10 %  Na    6.87 % Na2O
   Tantalum  70.23 %  Ta   85.76 % Ta2O5
   Niobium    5.15 %  Nb    7.37 % Nb2O5
   Oxygen    19.52 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Ta3.5Nb0.5O11
Help on Environment: Environment: Granitic pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1985
Help on Locality: Locality: Irtysh River area, eastern Kazakhstan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: ICSD 201714
  PDF 38-391
 

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Irtyshite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:5.90113
Help on Cell Dimensions: Cell Dimensions: a = 6.231, c = 36.77, Z = 6; V = 1,236.35 Den(Calc)= 7.27
Help on Crystal System: Crystal System: Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 63/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.029(1), 2.78(0.9), 3.082(0.9),
 

Physical Properties of Irtyshite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 7.03
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white
 

Optical Properties of Irtyshite

Help on Optical Data: Optical Data: Uniaxial (?).
  NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.1623) where Ncalc=Dcalc*KC+1
NCalc= 2.14 - from Gladstone-Dale relationship (KC = 0.1623) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Noted.
Help on RL Bireflectance: RL Bireflectance: Noted.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Irtyshite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 486 nm   18.00   19.00 
   
 553 nm   18.60   19.50 
 589 nm   18.90   19.60 
 656 nm   18.50   18.70 
Calculated Relative Intensity Colors of Irtyshite in Air
Relative
Intensity
   0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 490%
R1                      
R2                      
 

Calculated Properties of Irtyshite

Help on Electron Density: Electron Density:

relectron=6.22 gm/cc
note: rIrtyshite =7.27 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00017
Boson Index = 0.99983
Help on Photoelectric: Photoelectric:

PEIrtyshite = 853.38 barns/electron
U=PEIrtyshite x relectron=5,311.44 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Irtyshite is Not Radioactive

 

Irtyshite Classification

Help on  Dana Class: Dana Class: 8.6.2.3 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.6)Dana Type
  (8.6.2)Dana Group
 
8.6.2.1 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2
 
8.6.2.2 Natrotantite Na2Ta4O11 R 3-c 3 2/m
 
8.6.2.3 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m
Help on  Strunz Class: Strunz Class: IV/D.26-30 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.26 - Lithiotantite - Cesplumtantite series
 
IV/D.26-10 Lithiotantite Li(Ta,Nb)3O8 P 21/c 2/m
 
IV/D.26-20 Natrotantite Na2Ta4O11 R 3-c 3 2/m
 
IV/D.26-30 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m
 
IV/D.26-40 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2
 
IV/D.26-50 Ungursaite? NaCa5(Ta,Nb)24O65(OH) P 63/m,P 63 Hex
 
IV/D.26-60 Cesplumtantite (Cs,Na,Ca)2(Pb,Sb,Sn)3Ta8O24 Unk Tetra
 

Other Irtyshite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Irtyshite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Irtyshite

Na2(Ta,Nb)4O11
Dana No: 8.6.2.3 Strunz No: IV/D.26-30
Locality:

 

Notes:

 

 
   
 
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