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Akaogiite

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Formula:
TiO2
Crystal System:
Monoclinic
Name:
Named in honor of Masaki Akaogi (赤荻正樹), Professor in the Department of Chemistry, Gakushuin University, Tokyo, Japan, for his "seminal contributions to experimental petrology, calorimetry, and mineralogy, including experimental characterization of high-pressure polymorphs of TiO2 relevant to planetary deep interiors."
A TiO2 polymorph with a baddeleyite-like structure, resulting from high pressure impact at a meteorite crater.


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Classification of AkaogiiteHide

Approved
Approval Year:
2008
First Published:
2010
4.D0.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
0 :

Chemical Properties of AkaogiiteHide

Formula:
TiO2

Crystallography of AkaogiiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P1 21/c 1
Cell Parameters:
a = 4.606 Å, b = 4.986 Å, c = 4.933 Å
β = 99.17°
Ratio:
a:b:c = 0.924 : 1 : 0.989
Unit Cell V:
111.84 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.929Å(100)
2.626Å(91)
2.494Å(24)
2.437Å(42)
2.017Å(40)
1.742Å(40)
1.686Å(42)
1.54Å(31)

Type Occurrence of AkaogiiteHide

Associated Minerals at Type Locality:
Reference:
El Goresy, A., Dubrovinsky, L.S., Gillet, P., Graup, G., Chen, M. (2010) Akaogiite: An ultra-dense polymorph of TiO2 with seven-coordinated titanium, in shocked garnet gneisses from the Ries Crater, Germany. American Mineralogist: 95: 892-895.

Synonyms of AkaogiiteHide

Relationship of Akaogiite to other SpeciesHide

Other Members of this group:
BaddeleyiteZrO2Mon. 2/m : P21/b

Related Minerals - Nickel-Strunz GroupingHide

4.D0.Achalaite(Fe2+,Mn)(Ti,Fe3+,Ta)(Nb,Ta)2O8Mon. 2/m : B2/b
4.D0.AndymcdonalditeFe2TeO6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm

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 AkaogiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
El Goresy, A., Dubrovinsky, L.S., Gillet, P., Graup, G., Chen, M. (2010) Akaogiite: An ultra-dense polymorph of TiO2 with seven-coordinated titanium, in shocked garnet gneisses from the Ries Crater, Germany. American Mineralogist: 95: 892-895.

Internet Links for AkaogiiteHide

Localities for AkaogiiteHide

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.
Germany (TL)
 
  • Baden-Württemberg
    • Stuttgart Region
      • Ostalbkreis
        • Riesbürg
IMA website
  • Bavaria
    • Swabia
      • Donau-Ries District
        • Amerdingen
IMA website
IMA website
 
Mineral and/or Locality  
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