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 ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember 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

Akhtenskite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
MnO2
System:
Hexagonal
Colour:
Light grey to black
Name:
Named after its discovery locality in Russia.
Polymorph of:
Ramsdellite Group.

Synthetic akhtenskite coupled with goethite may be used in arsenic removal (Shih et al., 2015).


Classification of Akhtenskite

Approved
Approval Year:
1982
4.DB.15b

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
4.4.10.1

4 : SIMPLE OXIDES
4 : AX2
7.18.5

7 : Oxides and Hydroxides
18 : Oxides of Mn

Physical Properties of Akhtenskite

Diaphaneity (Transparency):
Opaque
Colour:
Light grey to black
Streak:
black
Cleavage:
Distinct/Good
on {001}
Density:
4.78 g/cm3 (Calculated)

Optical Data of Akhtenskite

Type:
Uniaxial

Chemical Properties of Akhtenskite

IMA Formula:
MnO2
Elements listed in formula:
Analytical Data:
Sufficient material for direct chemical analysis cannot be separated.
Energy-dispersive analysis shows Mn as the only cationic species; Mn4+ and O2- were confirmed by X-ray photoelectron spectroscopy, as was the absence of OH- and H2O.

Crystallography of Akhtenskite

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 2.84 Å, c = 4.6 Å
Ratio:
a:c = 1 : 1.62
Unit Cell Volume:
V 32.13 ų (Calculated from Unit Cell)
Z:
1
Morphology:
as microscopic crystals, flaky to platy on {001}, in parallel aggregates, sometimes in rows at 120°, probably due to replacement of an earlier hexagonal mineral;
as flaky polycrystalline aggregates
Comment:
Handbook of Mineralogy gives range: a = 2.83–2.85, c = 4.47–4.88 Å.
X-Ray Powder Diffraction Data:
d-spacingIntensity
1.42(
1.65(
2.15(
2.45(
Comments:
Material from Mount Zarod, Russia; XRD pattern calculated from an electron diffraction pattern

Type Occurrence of Akhtenskite

Place of Conservation of Type Material:
Mining Institute, St Petersburg, Russia
Geological Setting of Type Material:
in "psilomelane" with other manganese oxides in an iron oxide deposit, probably bacterially altered from a previous mineral
Associated Minerals at Type Locality:

Relationship of Akhtenskite to other Species

Structurally related to group(s):
4.DB.05ArgutiteGeO2
4.DB.05CassiteriteSnO2
4.DB.05PlattneritePbO2
4.DB.05PyrolusiteMnO2
4.DB.05RutileTiO2
4.DB.05TripuhyiteFe3+Sb5+O4
4.DB.05TugarinoviteMoO2
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb25+O6
4.DB.10Tapiolite-(Fe)Fe2+Ta2O6
4.DB.10Tapiolite-(Mn)Mn2+Ta2O6
4.DB.10OrdoñeziteZnSb25+O6
4.DB.15cNsutiteMnx2+Mn4+1-xO2-2x(OH)2x
4.DB.15aParamontroseiteVO2
4.DB.15aRamsdelliteMn4+O2
4.DB.20ScrutinyitePbO2
4.DB.25Ishikawaite(U,Fe,Y)NbO4
4.DB.25Ixiolite(Ta,Mn,Nb)O2
4.DB.25Samarskite-(Y)(Y,Ce,U,Fe,Nb)(Nb,Ta,Ti)O4
4.DB.25SrilankiteTi2ZrO6
4.DB.25Yttrocolumbite-(Y)(Y,U,Fe2+)(Nb,Ta)O4
4.DB.25Calciosamarskite(Ca,Fe,Y)(Nb,Ta,Ti)O4
4.DB.25Samarskite-(Yb)YbNbO4
4.DB.30FerberiteFe2+WO4
4.DB.30HübneriteMn2+WO4
4.DB.30SanmartiniteZnWO4
4.DB.30KrasnoselskiteCoWO4
4.DB.30HeftetjerniteScTaO4
4.DB.30HuanzalaiteMgWO4
4.DB.35Columbite-(Fe)Fe2+Nb2O6
4.DB.35Tantalite-(Fe)Fe2+Ta2O6
4.DB.35Columbite-(Mn)Mn2+Nb2O6
4.DB.35Tantalite-(Mn)Mn2+Ta2O6
4.DB.35Columbite-(Mg)MgNb2O6
4.DB.35QitianlingiteFe22+Nb2W6+O10
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)MgTa2O6
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8
4.DB.40LithiotantiteLiTa3O8
4.DB.40LithiowodginiteLiTa3O8
4.DB.40TitanowodginiteMn2+TiTa2O8
4.DB.40WodginiteMn2+Sn4+Ta2O8
4.DB.40FerrotitanowodginiteFe2+TiTa2O8
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteTiV3+O3(OH)
4.DB.50Carmichaelite(Ti,Cr,Fe)(O,OH)2
4.DB.55AlumotantiteAlTaO4
4.DB.60BiehliteSb23+MoO6
7.18.1ManganositeMn2+O
7.18.2HausmanniteMn2+Mn23+O4
7.18.3PyrolusiteMnO2
7.18.4RamsdelliteMn4+O2
7.18.6FeitknechtiteMn3+O(OH)
7.18.7ManganiteMn3+O(OH)
7.18.8GroutiteMn3+O(OH)
7.18.9NsutiteMnx2+Mn4+1-xO2-2x(OH)2x
7.18.10PyrochroiteMn2+(OH)2
7.18.11Birnessite(Na,Ca,K)0.6(Mn4+,Mn3+)2O4 · 1.5H2O
7.18.12Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
7.18.13CianciulliiteMg2Mn2+Zn2(OH)10 · 2-4H2O

Other Names for Akhtenskite

Name in Other Languages:

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 Akhtenskite

Reference List:
Chukhrov, F.V., Gorshkov, A.I., Drits, V.S. (1987) Advances in the crystal chemistry of manganese oxides. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 16: 210-221. [in Russian]

Chukhrov, F.V., Gorshkov, A.I., Drits, V.S. (1987) Advances in the crystal chemistry of manganese oxides. International Geology Review: 29: 435-444.

Chukhrov, F.V., Gorshkov, A.I., Sivtsov, A.V., Berezovskaya, V.V., Dikov, Y.P., Dubinina, G.A., Varinov, N.N. (1989) Akhtenskite - the natural analog of ε-MnO2. Izvestiya Akademii Nauk SSSR, Ser. Geol.: 9: 75-80. [in Russian]

Chukhrov, F.V., Gorshkov, A.I., Sivtsov, A.V., Berezovskaya, V.V., Dikov, Y.P., Dubinina, G.A., Varinov, N.N. (1989) Akhtenskite - the natural analog of ε-MnO2. International Geology Review: 31: 1068-1072.

Jambor, J.L., Grew, E.S. (1990) New mineral names. American Mineralogist: 75: 931. [Chukhrov et al. abstract]

Anthony, J.W. et al. (1997) Handbook of Mineralogy, Vol. 3, 9.

Shih, Y.-J., Huang, R.-L. and Huang, Y.H. (2015): Adsorptive removal of arsenic using a novel akhtenskite coated wastegoethite. Journal of Cleaner Production: 87: 897-905

Internet Links for Akhtenskite

mindat.org URL:
https://www.mindat.org/min-71.html
Please feel free to link to this page.

Localities for Akhtenskite

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.
Hungary
 
  • Borsod-Abaúj-Zemplén Co.
    • Bükk Mts
      • Répáshuta
Németh et al (2014)
Japan
 
  • Honshu Island
    • Kanto Region
      • Tochigi Prefecture
        • Kanuma City
Akira Kato (undated manuscript): Country rock and Minerals of the Kaso mine, Kanuma City, Tochigi Prefecture. (in japanese)
Romania
 
  • Suceava Co.
    • Suceava district
      • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
http://minerals-of-the-carpathians.eu
Russia
 
  • Far-Eastern Region
    • Primorskiy Kray
J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
        • Kusinskii raion
          • Magnitka
[Clark, 1993 - "Hey's Mineral Index, 3rd Edition"]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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 1993-2017, 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: June 24, 2017 01:06:23 Page generated: April 28, 2017 08:07:14
Go to top of page