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Ashanite

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Formula:
(Nb,Ta,U,Fe,Mn)4O8
Colour:
Dark brown to pitch-black; brownish red in thin section
Lustre:
Resinous, Sub-Metallic
Hardness:
5½ - 6½
Specific Gravity:
6.61
Crystal System:
Orthorhombic
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


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Classification of AshaniteHide

Discredited
18.3.8

18 : Niobates and Tantalates
3 : Niobates and tantalates containing U but not rare earths

Physical Properties of AshaniteHide

Resinous, Sub-Metallic
Transparency:
Opaque
Colour:
Dark brown to pitch-black; brownish red in thin section
Streak:
Brown
Hardness:
5½ - 6½ on Mohs scale
Hardness:
VHN100=570 - 851 - Vickers
Fracture:
Conchoidal, Sub-Conchoidal
Density:
6.61 g/cm3 (Measured)    6.6 g/cm3 (Calculated)

Optical Data of AshaniteHide

Type:
Biaxial (+)
RI values:
nα = 2.310 nβ = 2.350 nγ = 2.400
2V:
Measured: 70° to 75°, Calculated: 86°
Max Birefringence:
δ = 0.090
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
none
Reflectivity:
440 nmR1=12.1%R2= 12.1%
460 nmR1=11.4%R2= 11.5%
480 nmR1=11.2%R2= 11.3%
500 nmR1=11.0%R2= 11.0%
520 nmR1=11.0%R2= 11.0%
540 nmR1=10.9%R2= 10.9%
560 nmR1=10.9%R2= 10.8%
580 nmR1=10.8%R2= 10.8%
600 nmR1=10.8%R2= 10.7%
620 nmR1=10.7%R2= 10.7%
640 nmR1=10.7%R2= 10.6%
660 nmR1=10.6%R2= 10.6%
680 nmR1=10.6%R2= 10.6%
700 nmR1=10.6%R2= 10.6%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 12.1%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Pale bluish grey
Pleochroism:
Weak
Comments:
X = light brownish red, Z = dark brownish red; Orientation: X = b, Y = a, Z = c

Chemical Properties of AshaniteHide

Formula:
(Nb,Ta,U,Fe,Mn)4O8

Crystallography of AshaniteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pban
Cell Parameters:
a = 5.869 Å, b = 4.873 Å, c = 5.216 Å
Ratio:
a:b:c = 1.204 : 1 : 1.07
Unit Cell V:
149.18 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Single crystals are mentioned, but the habit is not stated.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.95 (10)
3.65 (5)
2.54 (3)
2.51 (3)
2.38 (3)
1.729 (3)
2.874 (2)
Comments:
Recorded on type material

Other Language Names for AshaniteHide

German:Ashanit
Spanish:Ashanita

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

18.3.1LiandratiteU(Nb,Ta)2O8Trig.
18.3.2Uranmicrolite (of Hogarth 1977)Iso.
18.3.3Betafite (of Hogarth 1977)A2-mB2X6-wY1+wIso. m3m (4/m 3 2/m) : Fd3m
18.3.4Plumbobetafite (of Hogarth 1977)A2-mB2X6-wY1-n
18.3.5PetscheckiteUFe(Nb,Ta)2O8Hex.
18.3.6Hydroxy-petscheckiteUFe1/3(Nb,Ta)2O7(O,OH)
18.3.7Oxy-petscheckiteUFe2/3(Nb,Ta)2O8

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AshaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 AshaniteHide

Localities for AshaniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China
 
  • Xinjiang Autonomous Region
    • Yili Hasake Autonomous Prefecture (Ili Kazakh Autonomous Prefecture)
      • Aletai Prefecture (Altay Prefecture)
        • Fuyun Co. (Koktokay Co.)
          • Ayoubulake pegmatite field
Rubo Zhang and Fengming Han (1983): Acta Mineralogica Sinica 3(4), 313-317
          • Koktokay pegmatite field (Keketuohai pegmatite field)
            • Altay Mine
Zhang Rubo, Han Fengming, and Du Chongliang (1985): Geochemistry [China] 4(2), 192-95.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
          • Jáchymov (St Joachimsthal)
Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
Madagascar
 
  • Antananarivo Province
    • Vakinankaratra Region
      • Sahatany Pegmatite Field (Mt Ibity area)
        • Sahatany Valley
Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Romania
 
  • Suceava Co.
    • Suceava district
      • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
http://minerals-of-the-carpathians.eu
Mineral and/or Locality  
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