Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Ashanite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
(Nb,Ta,U,Fe,Mn)4O8
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

Discredited
18.3.8

18 : Niobates and Tantalates
3 : Niobates and tantalates containing U but not rare earths
mindat.org URL:
http://www.mindat.org/min-387.html
Please feel free to link to this page.

Physical Properties of Ashanite

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

Crystallography of Ashanite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pban
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 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Single crystals are mentioned, but the habit is not stated.
X-Ray 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

Optical Data of Ashanite

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 Ashanite

Formula:
(Nb,Ta,U,Fe,Mn)4O8
Essential elements:
All elements listed in formula:
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.-%
Empirical Formula:
(Nb1.61Fe0.66Mn0.63Ta0.61U0.51REE0.07)=4.09O7.98

Relationship of Ashanite to other Species

Other Names for Ashanite

Name in Other Languages:
German:Ashanit
Spanish:Ashanita

Other Information

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 Ashanite

Reference List:
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

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
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  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 19, 2015 20:16:58 Page generated: April 19, 2015 10:18:43