Mineralogy Database

Irtyshite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Irtyshite + Pronunciation Say IRTYSHITE
Help on Synonym: Synonym: ICSD 201714
  PDF 38-391

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 - Dipyramidal H-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 Diaphaneity: Diaphaneity: 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
   0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 490%

Calculated Properties of Irtyshite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.22 gm/cc
note: Specific Gravity of Irtyshite =7.27 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001779607
Boson Index = 0.9998220393
Help on Photoelectric: Photoelectric: PEIrtyshite = 853.38 barns/electron
U=PEIrtyshite x rElectron Density=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: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.06)Dana Type
  (08.06.02)Calciotantite Group Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2 Natrotantite Na2Ta4O11 R 3-c 3 2/m Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m
Help on  Strunz Class: Strunz Class: 04.DJ.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DJ -With large (� medium-sized) cations; polyhedral frameworks
04.DJ.05 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2
04.DJ.05 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m
04.DJ.05 Natrotantite Na2Ta4O11 R 3-c 3 2/m

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.DJ.05





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