Maohokite
A valid IMA mineral species
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About Maohokite
Ho-Kwang (David) Mao
Formula:
MgFe2O4
Specific Gravity:
5.33 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Ho-Kwang (David) Mao (毛河光) (b. 18 June 1941, Shanghai, China), geologist at the Geophysical Laboratory of the Carnegie Institution for Science. He is an expert in high pressures and temperatures, and has repeatedly achieved the highest laboratory pressures in the world. Among many honors, he was awarded the 2005 Roebling Medal. The species davemaoite is also named after him.
Dimorph of:
Maohokite was formed from subsolidus decomposition of ankerite Ca(Fe2+,Mg)(CO3)2 via a self-oxidation-reduction reaction at impact pressure and temperature of 25–45 GPa and 800–900 °C.
Unique Identifiers
Mindat ID:
52154
Long-form identifier:
mindat:1:1:52154:5
GUID
(UUID V4):
(UUID V4):
20c273a9-8f1d-4373-a79c-c326fc23c20d
IMA Classification of Maohokite
Approved
Approval year:
2017
First published:
2018
Approval history:
IMA 2017-047
Classification of Maohokite
4.BB.40
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations
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 |
|---|---|---|
| Mhk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Maohokite
Density:
5.33 g/cm3 (Calculated)
Chemistry of Maohokite
Mindat Formula:
MgFe2O4
Elements listed:
Crystallography of Maohokite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.663 Å | (100) |
| 1.932 Å | (90) |
| 1.673 Å | (20) |
| 1.533 Å | (50) |
| 1.431 Å | (12) |
| 1.155 Å | (15) |
| 1.131 Å | (12) |
| 1.087 Å | (30) |
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 30 : Terrestrial impact minerals |
Type Occurrence of Maohokite
General Appearance of Type Material:
Nano sized crystallites.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Geological Museum, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Tianhe, Kehua Street 511, Guangzhou 510640, China, catalogue number XY-shock gneiss 290.
Geological Setting of Type Material:
Shocked gneiss.
Associated Minerals at Type Locality:
Reference:
Chen, M., Shu, J., Xie, X., & Tan, D. (2018) Maohokite, a post‐spinel polymorph of MgFe2O4 in shocked gneiss from the Xiuyan crater in China. Meteoritics & Planetary Science: 2018: 1-8.
Synonyms of Maohokite
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Maohokite associated with Magnesioferrite | MgFe3+2O4 |
| 1 photo of Maohokite associated with Calcite | CaCO3 |
Related Minerals - Strunz-mindat Grouping
| 4.BB. | Elgoresyite | (Mg5Si2)O9 |
| 4.BB. | Chenmingite | FeCr2O4 |
| 4.BB. | Dellagiustaite | V2+Al2O4 |
| 4.BB. | Thermaerogenite | CuAl2O4 |
| 4.BB. | Chukochenite | LiAl5O8 |
| 4.BB. | Garpenbergite | Mn6◻AsSbO10(OH)2 |
| 4.BB. | Magnéliite | Ti3+2Ti4+2O7 |
| 4.BB. | Jianmuite | ZrTi4+Ti3+5Al3O16 |
| 4.BB.05 | Chromite | Fe2+Cr3+2O4 |
| 4.BB.05 | Cochromite | CoCr2O4 |
| 4.BB.05 | Coulsonite | Fe2+V3+2O4 |
| 4.BB.05 | Cuprospinel | Cu2+Fe3+2O4 |
| 4.BB.05 | Filipstadite | (Fe3+0.5Sb5+0.5)Mn2O4 |
| 4.BB.05 | Franklinite | Zn2+Fe3+2O4 |
| 4.BB.05 | Gahnite | ZnAl2O4 |
| 4.BB.05 | Galaxite | Mn2+Al2O4 |
| 4.BB.05 | Hercynite | Fe2+Al2O4 |
| 4.BB.05 | Jacobsite | Mn2+Fe3+2O4 |
| 4.BB.05 | Manganochromite | Mn2+Cr2O4 |
| 4.BB.05 | Magnesiocoulsonite | MgV2O4 |
| 4.BB.05 | Magnesiochromite | MgCr2O4 |
| 4.BB.05 | Magnesioferrite | MgFe3+2O4 |
| 4.BB.05 | Magnetite | Fe2+Fe3+2O4 |
| 4.BB.05 | Nichromite | (Ni,Co,Fe)(Cr,Fe,Al)2O4 |
| 4.BB.05 | Qandilite | (Mg,Fe3+)2(Ti,Fe3+,Al)O4 |
| 4.BB.05 | Spinel | MgAl2O4 |
| 4.BB.05 | Trevorite | Ni2+Fe3+2O4 |
| 4.BB.05 | Ulvöspinel | TiFe2+2O4 |
| 4.BB.05 | Vuorelainenite | Mn2+V3+2O4 |
| 4.BB.05 | Zincochromite | ZnCr2O4 |
| 4.BB.05 | Harmunite | CaFe2O4 |
| 4.BB.05 | Wernerkrauseite | Ca(Fe3+,Mn3+)2Mn4+O6 |
| 4.BB.05 | Deltalumite | (Al0.67◻0.33)Al2O4 |
| 4.BB.05 | Guite | Co2+Co3+2O4 |
| 4.BB.10 | Hausmannite | Mn2+Mn3+2O4 |
| 4.BB.10 | Hetaerolite | ZnMn2O4 |
| 4.BB.10 | Manganostibite | (Mn,Fe)7SbAsO12 |
| 4.BB.15 | Maghemite | (Fe3+0.67◻0.33)Fe3+2O4 |
| 4.BB.15 | Titanomaghemite | (Ti4+0.5◻0.5)Fe3+2O4 |
| 4.BB.20 | Tegengrenite | (Mn3+0.5Sb5+0.5)Mg2O4 |
| 4.BB.25 | Xieite | Fe2+Cr2O4 |
| 4.BB.30 | Carmeltazite | ZrAl2Ti4O11 |
| 4.BB.35 | Feiite | Fe2+2(Fe2+Ti4+)O5 |
| 4.BB.45 | Tschaunerite | (Fe2+)(Fe2+Ti4+)O4 |
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.
Internet Links for Maohokite
mindat.org URL:
https://www.mindat.org/min-52154.html
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References for Maohokite
Reference List:
Localities for Maohokite
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.
China (TL) | |
|
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Xiuyan Crater, Pianling, Xiuyan Co., Anshan, Liaoning, China