Tashelgite
A valid IMA mineral species
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About Tashelgite
Formula:
CaMgFe2+Al9O16(OH)
Colour:
Blue-green
Lustre:
Vitreous
Hardness:
7½
Specific Gravity:
3.67 (Calculated)
Crystal System:
Monoclinic
Name:
Named for the type locality.
Type locality is a calc-skarnoid occurrence near the mouth of the Tashelga River, Kuznetsky Alatau, Gorny Shoria (53°22′60.3N, 88°17′07.1E).
Unique Identifiers
Mindat ID:
40270
Long-form identifier:
mindat:1:1:40270:9
IMA Classification of Tashelgite
Approved
Approval year:
2010
Classification of Tashelgite
4.FG.25
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
G : Hydroxides with OH, without H2O; unclassified
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
G : Hydroxides with OH, without H2O; unclassified
7.11.19.
7 : MULTIPLE OXIDES
11 : Miscellaneous
7 : MULTIPLE OXIDES
11 : Miscellaneous
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 for Standard |
|---|---|---|
| Thg | 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 Tashelgite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Blue-green
Comment:
Fibrous segregations are occasionally white
Hardness:
7½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed.
Density:
3.67 g/cm3 (Calculated)
Optical Data of Tashelgite
Type:
Biaxial (-)
RI values:
nα = 1.736(2) nβ = 1.746(2) nγ = 1.750(2)
2V:
Calculated: 20°
Max. Birefringence:
δ = 0.014
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r < v, strong
Pleochroism:
Visible
Comments:
X = blue-green, Y = light yellowish green, Z = almost colourless
Chemistry of Tashelgite
Mindat Formula:
CaMgFe2+Al9O16(OH)
Element Weights:
Common Impurities:
Mn
Crystallography of Tashelgite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Pb
Setting:
Pc
Cell Parameters:
a = 5.6973(1) Å, b = 17.1823(4) Å, c = 23.5718(5) Å
β = 90.046(3)°
β = 90.046(3)°
Ratio:
a:b:c = 0.332 : 1 : 1.372
Unit Cell V:
2307.5 ų
Z:
8
Morphology:
Prismatic crystals elongated on [100] with main forms {001} and {010}.
Twinning:
Polysynthetic twins parallel to (001).
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0018315 | Tashelgite | Rastsvetaeva R K, Aksenov S M, Verin I A (2010) Crystal structure of complex natural aluminum magnesium calcium iron oxide Crystallography Reports 55 563-568 | 2010 | Tashelga River, Western Siberia, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.79 Å | (48) |
| 2.845 Å | (43) |
| 2.616 Å | (100) |
| 2.584 Å | (81) |
| 2.501 Å | (39) |
| 2.437 Å | (44) |
| 2.406 Å | (61) |
| 2.202 Å | (72) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations |
Type Occurrence of Tashelgite
General Appearance of Type Material:
Long prismatic to acicular, slightly flattened crystals and their parallel intergrowths up to 0.2 x 0.3 x 2 mm in size.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, no. 3983/1
Geological Setting of Type Material:
In calc-skarnoid zones.
Associated Minerals at Type Locality:
Synonyms of Tashelgite
Other Language Names for Tashelgite
Dutch:Tashelgiet
German:Tashelgit
Common Associates
Associations Based on Photo Data:
| 3 photos of Tashelgite associated with Vesuvianite Group | [X42][X38][X28][X1][Y1][Y24][Y38][T14][T2](Si2O7)4(SiO4)10(O10)2(O11)8 |
Related Minerals - Strunz-mindat Grouping
| 4.FG.05 | Janggunite | Mn5-x(Mn,Fe)1+xO8(OH)6 |
| 4.FG.10 | Cesàrolite | PbMn4+3O6(OH)2 |
| 4.FG.15 | Kimrobinsonite | (Ta,Nb)(OH)5-2x(O,CO3)x ; x near 1.2 |
| 4.FG.20 | Langhofite | Pb2(OH)[WO4(OH)] |
Other Information
Notes:
Tashelgite does not dissolve in hydrochloric and sulphuric acids.
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 Tashelgite
mindat.org URL:
https://www.mindat.org/min-40270.html
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References for Tashelgite
Reference List:
Rastsvetaeva, R. K., Aksenov, S. M., Verin, I. A. (2010) Crystal structure of complex natural aluminum magnesium calcium iron oxide. Crystallography Reports, 55 (4) 563-568 doi:10.1134/s106377451004005x
Rastsvetaeva, R. K., Aksenov, S. M., Chukanov, N. V. (2010) Structure of the tashelgite mineral Ca2Mg2Fe22+Al18O32(OH)2 from Western Siberia: A new structure type. Doklady Chemistry, 434 (1). 233-236 doi:10.1134/s0012500810090065
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2010) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) CNMNC Newsletter No 4. Mineralogical Magazine, 74 (4) 797-800 doi:10.1180/s0026461x00038925
Ananyev, S. A., Konovalenko, S. I., Rastsvetaeva, R. K., Aksenov, S. M., Chukanov, N. V., Sapozhnikov, A. N., Zagorsky, V. E., Virus, A. A. (2011) Tashelgite, CaMgFe2 + Al9O16(OH), a new mineral species from calc-skarnoid in Gorny Shoria. Geology of Ore Deposits, 53 (8) 751-757 doi:10.1134/s1075701511080022
Localities for Tashelgite
Showing 1 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Williams et al. (2010) +1 other reference |
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Tashelginskoye Fe-(Co) deposit, Tashelga River, Gornaya Shoria Region, Kemerovo Oblast, Russia