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Ashanite

A discredited species name
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About AshaniteHide

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.

Possibly to be redefined (see Zubkova et al. 2020).


Unique IdentifiersHide

Mindat ID:
387
Long-form identifier:
mindat:1:1:387:2
GUID
(UUID V4):
a1534f36-f7c0-441e-91d9-efe0cfc0f117

IMA Classification of AshaniteHide

Discredited

Classification of AshaniteHide

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:
WavelengthR1R2
440 nm12.1% 12.1%
460 nm11.4% 11.5%
480 nm11.2% 11.3%
500 nm11.0% 11.0%
520 nm11.0% 11.0%
540 nm10.9% 10.9%
560 nm10.9% 10.8%
580 nm10.8% 10.8%
600 nm10.8% 10.7%
620 nm10.7% 10.7%
640 nm10.7% 10.6%
660 nm10.6% 10.6%
680 nm10.6% 10.6%
700 nm10.6% 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

Chemistry of AshaniteHide

Mindat 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 Å(10)
3.65 Å(5)
2.54 Å(3)
2.51 Å(3)
2.38 Å(3)
1.729 Å(3)
2.874 Å(2)
Comments:
Recorded on type material

Other Language Names for AshaniteHide

German:Ashanit
Spanish:Ashanita

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.

Internet Links for AshaniteHide

References 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 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.
China
 
  • Xinjiang
    • 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)
          • Koktokay pegmatite field (Keketuohai pegmatite field)
            • Altay Mine
Zhang Rubo et al. (1985)
Czech Republic
 
  • Karlovy Vary Region
    • Karlovy Vary District
      • Jáchymov
Pauliš P. et al. (Kutna Hora, issue 1)
Madagascar
 
  • Vakinankaratra
    • Antsirabe II District
      • Ibity
        • Sahatany Valley
Ranorosoa (1986)
Romania
 
  • Suceava County
    • Iacobeni
minerals-of-the-carpathians.eu (2008)
      • Tolovanu
Hîrtopanu (1997) +1 other reference
 
Mineral and/or Locality  
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