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|System:||Orthorhombic||Colour:||Dark brown to ...|
|Lustre:||Resinous, Sub-Metallic||Hardness:||5½ - 6½|
|Name:||From Altai and SHAN, Chinese for mountains, for the occurrence in the Altai Mountains, China.|
Originally thought to be the Nb-dominant analogue of Ixiolite, the type material is now believed to be a mixture of several minerals including Ixiolite, Samarskite-(Y) and Uranmicrolite.
Originally reported from Koktokay (Keketuohai) Pegmatite field, Fuyun Co., Altay (Aletai) Prefecture, Ili Kazakh (Yili Hasake) Autonomous Prefecture, Xinjiang (Xinjiang-Uygur) Autonomous Region, China
Classification of Ashanite
|Hey's CIM Ref.:||18.3.8|
18 : Niobates and Tantalates
3 : Niobates and tantalates containing U but not rare earths
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Physical Properties of Ashanite
|Colour:||Dark brown to pitch-black; brownish red in thin section|
|Hardness (Mohs):||5½ - 6½|
|Hardness (Vickers):||VHN100=570 - 851|
|Density (measured):||6.61 g/cm3|
|Density (calculated):||6.6 g/cm3|
Crystallography of Ashanite
|Class (H-M):||mmm (2/m 2/m 2/m) - Dipyramidal|
|Cell Parameters:||a = 5.869Å, b = 4.873Å, c = 5.216Å|
|Ratio:||a:b:c = 1.204 : 1 : 1.07|
|Unit Cell Volume:||V 149.18 Å³ (Calculated from Unit Cell)|
|Morphology:||Single crystals are mentioned, but the habit is not stated.|
|X-Ray Powder Diffraction:|
|Comments:||Recorded on type material|
Optical Data of Ashanite
|RI values:||nα = 2.310 nβ = 2.350 nγ = 2.400|
|2V:||Measured: 70° to 75°, Calculated: 86°|
|Maximum Birefringence:||δ = 0.090|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Surface Relief:||Very High|
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 12.1%.
R1 shown in black, R2 shown in red
|Colour in reflected light:||Pale bluish grey|
|Comments:||X = light brownish red, Z = dark brownish red; Orientation: X = b, Y = a, Z = c|
Chemical Properties of Ashanite
|Simplified for copy/paste:||(Nb,Ta,U,Fe,Mn)4O8|
|Essential elements:||Nb, O|
|All elements listed in formula:||Fe, Mn, Nb, O, Ta, U|
|Analytical Data:||Analysis of type material|
U3O8 (23.81) Nb2O5 (36.76) Ta2O5 (23.41) REE2O3 (1.40) FeO (8.25) MnO (7.77) sum 101.40 wt.-%
Relationship of Ashanite to other Species
|Related Minerals - Hey's Index Grouping:|
Other Names for Ashanite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Ashanite
Zhan Rubo, Tian Huixin, Peng Zhizhong, Ma Zhesheng, Han Fengming, and Jing Zebei (1980): A new mineral - Ashanite, (Nb,Ta,U,Fe,Mn)4O8. Chinese Science Bulletin [Kexue Tongbao] 25(6), 510-514 (in English). - American Mineralogist (1981) 66, 217 (abstract).
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 27.
Internet Links for Ashanite
Localities for Ashanite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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