Irtyshite
A valid IMA mineral species
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Formula:
Na2(Ta,Nb)4O11
Colour:
Colorless
Lustre:
Adamantine
Hardness:
7
Specific Gravity:
7.03 (Calculated)
Crystal System:
Hexagonal
Member of:
Name:
Named for the Irtysh River, a major river close to the type locality. The Irtysh leads into the Ob River. The pair, taken together, form the seventh longest river in the world.
This page provides mineralogical data about Irtyshite.
Unique Identifiers
Mindat ID:
2049
Long-form identifier:
mindat:1:1:2049:3
GUID
(UUID V4):
(UUID V4):
51c797f8-3102-43ab-939b-4c5694206875
IMA Classification of Irtyshite
Approved
IMA Formula:
Na2Ta4O11
First published:
1985
Classification of Irtyshite
4.DJ.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
J : With large (+- medium-sized) cations; polyhedral frameworks
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
J : With large (+- medium-sized) cations; polyhedral frameworks
8.6.2.3
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
6 : (AB)6O11·nH2O
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
6 : (AB)6O11·nH2O
18.1.6
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Irt | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Irtyshite
Adamantine
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
7 on Mohs scale
Hardness:
VHN20=1190 kg/mm2 - Vickers
Comment:
VHN40 = 1030
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
7.03 g/cm3 (Calculated)
Optical Data of Irtyshite
Type:
Uniaxial
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
486nm | 18.0% | 19.0% |
553nm | 18.6% | 19.5% |
589nm | 18.9% | 19.6% |
656nm | 18.5% | 18.7% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 19.6%.
R1 shown in black, R2 shown in red
Pleochroism:
Non-pleochroic
Chemistry of Irtyshite
Mindat Formula:
Na2(Ta,Nb)4O11
Elements listed:
Crystallography of Irtyshite
Crystal System:
Hexagonal
Cell Parameters:
a = 6.23 Å, c = 36.77 Å
Ratio:
a:c = 1 : 5.902
Unit Cell V:
1,235.95 ų (Calculated from Unit Cell)
Z:
6
Comment:
Р6 3/m ог Р6 3
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
6.13 Å | (70) |
5.18 Å | (60) |
3.082 Å | (90) |
3.029 Å | (100) |
2.780 Å | (90) |
2.480 Å | (60) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Irtyshite
General Appearance of Type Material:
veins (0.02x0.2mm) and irregular grains (0.05mm)
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 43776.
Geological Setting of Type Material:
Granitic pegmatites
Associated Minerals at Type Locality:
Reference:
Voloshin, A.V., Pakhomovsky, Y.A., Bulgak, L.V., Perlina, G.A. (1985) Irtyshite - a new mineral from granitic pegmatites. Mineralogiceskij Zhurnal: 7: 83-87.
Synonyms of Irtyshite
Other Language Names for Irtyshite
Relationship of Irtyshite to other Species
Member of:
Other Members of this group:
Calciotantite | CaTa4O11 | Hex. 6 2 2 : P63 2 2 |
Natrotantite | Na2Ta4O11 | Trig. 3m (3 2/m) : R3c |
Related Minerals - Strunz-mindat Grouping
4.DJ.05 | Calciotantite | CaTa4O11 |
4.DJ.05 | Natrotantite | Na2Ta4O11 |
Other Information
Notes:
yellow-green cathodoluminescence
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Irtyshite
mindat.org URL:
https://www.mindat.org/min-2049.html
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References for Irtyshite
Reference List:
Localities for Irtyshite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Kazakhstan (TL) | |
| Voloshin et al. (1985) +1 other reference |
| В +34 other references |
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