Maohokite
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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.
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.
Classification of Maohokite
Physical Properties of Maohokite
Density:
5.33 g/cm3 (Calculated)
Chemical Properties of Maohokite
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):
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
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 Maohokite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chen, M., Shu, J., Xie, X. and Tan, D. (2017) Maohokite, IMA 2017-047. CNMNC Newsletter No. 39, October 2017, page 1281; Mineralogical Magazine: 81: 1279–1286.
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.
Internet Links for Maohokite
mindat.org URL:
https://www.mindat.org/min-52154.html
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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 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) | |
| Chen, M., Shu, J., Xie, X. and Tan, D. (2017) Maohokite, IMA 2017-047. CNMNC Newsletter No. 39, October 2017, page 1281; Mineralogical Magazine: 81: 1279–1286.; 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.; Yin, F.; Dai, D. (2020) A Study of Shock-Metamorphic Features of Feldspars from the Xiuyan Impact Crater. Minerals 10, 231. |
Xiuyan Crater, Pianling, Xiuyan Co., Anshan, Liaoning, China