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Akaogiite
A valid IMA mineral species
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Formula:
TiO2
Crystal System:
Monoclinic
Member of:
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."
Co-Type Localities:
Polymorph of:
A TiO2 polymorph with a baddeleyite-like structure, resulting from high pressure impact at a meteorite crater.
Unique Identifiers
Mindat ID:
35912
Long-form identifier:
mindat:1:1:35912:4
IMA Classification of Akaogiite
Approved
IMA Formula:
Ti4+O2
Approval year:
2008
First published:
2010
Classification of Akaogiite
4.D0.
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
0 :
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
0 :
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Aka | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Chemistry of Akaogiite
Mindat Formula:
TiO2
Elements listed:
Crystallography of Akaogiite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/c
Setting:
P121/c1
Cell Parameters:
a = 4.606 Å, b = 4.986 Å, c = 4.933 Å
β = 99.17°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.929 Å | (100) |
| 2.626 Å | (91) |
| 2.494 Å | (24) |
| 2.437 Å | (42) |
| 2.017 Å | (40) |
| 1.742 Å | (40) |
| 1.686 Å | (42) |
| 1.54 Å | (31) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 30 : Terrestrial impact minerals |
Type Occurrence of Akaogiite
Co-Type Localities:
General Appearance of Type Material:
Grains consisting of countless randomly oriented submicrometer particles. Optically distinguishable from rutile only in reflected light microscopy, through its slightly higher brightness and the intense royal blue color of its internal reflections in crossed nicols.
Place of Conservation of Type Material:
Collection of the Bayerisches Geoinstitut, Universität Bayreuth, Germany, El Goresy section No. BGI 3.
Geological Setting of Type Material:
Heavily shocked garnet-cordierite-sillimanite gneiss in a meteorite impact crater.
Associated Minerals at Type Locality:
Synonyms of Akaogiite
Other Language Names for Akaogiite
Relationship of Akaogiite to other Species
Related Minerals - Strunz-mindat Grouping
| 4.D0. | Dmitryvarlamovite | Ti2(Fe3+Nb)O8 |
| 4.D0. | Achalaite | (Fe2+,Mn)(Ti,Fe3+,Ta)(Nb,Ta)2O8 |
Other Information
Notes:
Exhibits blue fluorescence under the electron beam like both rutile and TiO2-II.
The mineral is extremely sensitive to any laser or focused electron beam irradiation and it inverts in seconds to rutile.
The mineral is extremely sensitive to any laser or focused electron beam irradiation and it inverts in seconds to rutile.
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 Akaogiite
mindat.org URL:
https://www.mindat.org/min-35912.html
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Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Akaogiite
Localities for Akaogiite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| El Goresy et al. (2010) |
| Tschauner +3 other references |
| El Goresy et al. (2010) |
| El Goresy et al. (2010) |