| |
 |
Irtyshite Mineral Data
|
|
|
General Irtyshite Information
|
 Chemical Formula: |
Na2(Ta,Nb)4O11 |
| 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 |
| Empirical Formula: |
Na2Ta3.5Nb0.5O11 |
| Environment: |
Granitic pegmatites. |
| IMA Status: |
Approved IMA 1985 |
| Locality: |
Irtysh River area, eastern Kazakhstan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Irtyshite + Pronunciation  |
| Synonym: |
ICSD 201714 |
| |
PDF 38-391 |
| |
Irtyshite Crystallography
|
| Axial Ratios: |
a:c = 1:5.90113 |
| Cell Dimensions: |
a = 6.231, c = 36.77, Z = 6; V = 1,236.35 Den(Calc)= 7.27 |
| Crystal System: |
Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P 63/m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.029(1), 2.78(0.9), 3.082(0.9), |
| |
Physical Properties of Irtyshite
|
| Cleavage: |
None |
| Color: |
Colorless. |
| Density: |
7.03 |
| Diaphaneity: |
Transparent |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
7 - Quartz |
| Luster: |
Adamantine |
| Streak: |
white |
| |
Optical Properties of Irtyshite
|
| 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
|
| RL Anisotrophism: |
Noted. |
| RL Bireflectance: |
Noted. |
| 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
|
| Electron Density: |
Bulk Density (Electron Density)=6.22 gm/cc
note: Specific Gravity of Irtyshite =7.27 gm/cc.
|
| Fermion Index: |
Fermion Index = 0.0001779607
Boson Index = 0.9998220393 |
| Photoelectric: |
PEIrtyshite = 853.38 barns/electron
U=PEIrtyshite x rElectron Density=5,311.44 barns/cc.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Irtyshite is Not Radioactive |
| |
Irtyshite Classification
|
| Dana Class: |
08.06.02.03 (08)Multiple Oxides with Nb, Ta, and Ti |
| |
(08.06)Dana Type |
| |
(08.06.02)Calciotantite Group |
| |
08.06.02.01 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2 |
| |
08.06.02.02 Natrotantite Na2Ta4O11 R 3-c 3 2/m |
| |
08.06.02.03 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m |
| 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
|
| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3) |
| 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
Search for Irtyshite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Irtyshite :
Ask about Irtyshite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Español
Print or Cut-and-Paste your Irtyshite Specimen Label here :
|
Irtyshite
Na2(Ta,Nb)4O11
Dana No: 08.06.02.03 Strunz No: 04.DJ.05
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.