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Ankangite

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Formula:
Ba(Ti,V3+,Cr)8O16
System:
Tetragonal
Name:
For the type locality.
A variety of Mannardite

Discredited in 2012 IMA 11-F (H2O-free variety of mannardite).

Classification of Ankangite

Discredited 2012
Explanation of status:
The mineral ankangite is discredited, since it corresponds to an H2O-free variety of mannardite (IMA 11-F, IMA Newsletter 13, Mineralogical Magazine, June 2012, Vol. 76(3), pp. 817)
7.9.29

7 : Oxides and Hydroxides
9 : Oxides of Ti
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http://www.mindat.org/min-238.html
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First Recorded Occurrence of Ankangite

Physical Properties of Ankangite

Adamantine, Vitreous
Fracture:
Irregular/Uneven

Crystallography of Ankangite

Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I4/m
Cell Parameters:
a = 10.139Å, c = 2.961Å
Ratio:
a:c = 1 : 0.292
Unit Cell Volume:
V 304.39 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Prismatic crystals with {100} and {110}

Optical Data of Ankangite

Type:
Uniaxial
Type:
Anisotropic
Anisotropism:
Distinct
Bireflectance:
Weak to distinct
Colour in reflected light:
Light rose-reddish grey
Pleochroism:
Weak
Comments:
O = pinkish grey, E = light pink, Orientation: E = c

Chemical Properties of Ankangite

Formula:
Ba(Ti,V3+,Cr)8O16
Essential elements:
All elements listed in formula:

Relationship of Ankangite to other Species

7.9.1HongquiiteTiO
7.9.2RutileTiO2
7.9.3AnataseTiO2
7.9.4BrookiteTiO2
7.9.5GeikieliteMgTiO3
7.9.6PerovskiteCaTiO3
7.9.7KassiteCaTi2O4(OH)2
7.9.8TausoniteSrTiO3
7.9.9Crichtonite(Sr,La,Ce,Y)(Ti,Fe3+,Mn)21O38
7.9.10Lucasite-(Ce)CeTi2(O,OH)6
7.9.11Hibonite(Ca,Ce)Al12O19
7.9.12Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6
7.9.13PyrophaniteMn2+TiO3
7.9.14IwakiiteMn2+Fe23+O4
7.9.15IlmeniteFe2+TiO3
7.9.16PseudobrookiteFe2TiO5
7.9.17UlvöspinelFe2TiO4
7.9.18PseudorutileFe2Ti3O9
7.9.19FreudenbergiteNa2(Ti,Fe)8O16
7.9.20KennedyiteMgFe23+Ti3O10
7.9.21Armalcolite(Mg,Fe2+)Ti2O5
7.9.22Högbomite(Mg,Fe)2(Al,Ti)5O10
7.9.23Qandilite(Mg,Fe)2(Ti,Fe,Al)O4
7.9.24Cafetite(Ca,Mg)(Fe,Al)2Ti4O12 · 4H2O
7.9.25Loveringite(Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38
7.9.26Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
7.9.27PrideriteK(Ti74+Fe3+)O16
7.9.28Jeppeite(K,Ba)2(Ti,Fe)6O13
7.9.30Ecandrewsite(Zn,Fe2+,Mn2+)TiO3
7.9.31LandauiteNaMnZn2(Ti,Fe)6Ti12O38

Other Names for Ankangite

Name in Other Languages:
German:Ankangit
Spanish:Ankangita

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 Ankangite

Reference List:
Xiong Ming, Ma Zhesheng, and Peng Zhizhong (1988): A new mineral - Ankangite. Chinese Science Bulletin [Kexue Tongbao] 33(18), 1401-1404 (in Chinese). - American Mineralogist (1991), 76, 2020 (abstract).

Xiong Ming, Ma Zhesheng, and Peng Zhizhong (1989): A new mineral - ankangite. Chinese Science Bulletin [Kexue Tongbao] 34(7), 592-596 (in Chinese). - American Mineralogist (1992), 77, 1119 (abstract).

Wu, X. J., Li, F. H. and Hashimoto, H. (1990): Electron microscope study of the incommensurately modulated structure of ankangite. Acta Crystallographica 46, 111-117.

Nicheng, S., Zhesheng, M. and Wei, L. (1991): Crystal structure determination of ankangite with one-dimensional incommensurate modulation. Acta Petrolog. Mineral. 10(8), 233-245 (in Chinese with English abstract). - American Mineralogist (1992), 77, 1119 (abstract).

Anthony, J. W., et al. (1997): Handbook of Mineralogy, Vol. 3, 15.

Internet Links for Ankangite

Localities for Ankangite

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.
Brazil
 
  • Minas Gerais
Tony Nikischer specimen and analysis; Jaroslav Hyrsl specimens
China (FRL)
 
  • Shaanxi Province
    • Ankang Prefecture
      • Hanbin District
Am Min 76 (1991), 2020
Italy
 
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Stazzema
          • Sant'Anna di Stazzema
Biagioni, C., Orlandi, P., & Pasero, M. (2008). Ankangite from Monte Arsiccio mine. (Apuan Alps, Tuscany): third world occurrence. Plinius, 34, 212; Biagioni, C., Orlandi, P., & Pasero, M. (2009). Ankangite from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy): occurrence, crystal structure, and classification problems in cryptomelane group minerals. Periodico di Mineralogia, 78, 3-11.
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Lake Baikal area
          • Slyudyanka (Sludyanka)
Proceedings of the Russian Mineralogical Society 136(5), 65-75.
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
Mineral and/or Locality  
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