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Xieite

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Xiande Xie
Formula:
FeCr2O4
System:
Orthorhombic
Member of:
Name:
Named by M. Chen, J. Shu, and H. Mao in 2008 in honor of Xiande Xie, the former president of the International Mineralogical Association from 1990 to 1994 and professor at the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, for his contribution to mineralogy and shock effects of minerals.
Dimorph of:
Spinel group. High-pressure polymorph of chromite.
The first natural occurrence of a high-pressure polymorph of chromite has been discovered in the shock-metamorphosed Suizhou meteorite. The composition of this high-pressure polymorph is identical to that of the precursor chromite. The Raman spectrum of this polymorph is distinct from that of chromite. The P-T conditions for the phase transformation from chromite to the CaTi2O4-structured polymorph are estimated at 20–23 GPa and 1800 to 2000 °C, respectively. This dense CaTi2O4-structured FeCr2O4 phase could be a host phase for Cr, Al, Fe, Mg and Mn and other metallic elements in the deep Earth.


Classification of Xieite

Approved
Approval Year:
2007
First Published:
2008
Approval History:
IMA 2007-056
4.BB.25

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

Physical Properties of Xieite

Comment:
harder than chromite
Density:
5.63 g/cm3 (Measured)    5.342 g/cm3 (Calculated)

Chemical Properties of Xieite

IMA Formula:
FeCr2O4
Elements listed in formula:

Crystallography of Xieite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 9.462(6) Å, b = 9.562(9) Å, c = 2.916(1) Å
Ratio:
a:b:c = 0.99 : 1 : 0.305
Unit Cell Volume:
V 263.8 ų
Z:
4
Comment:
space group Bbmm
X-Ray Powder Diffraction Data:
d-spacingIntensity
2.675 (100)
2.389 (20)
2.089 (10)
1.953 (90)
1.566 (60)
1.439 (15)
1.425 (15)
1.337 (40)
(

Type Occurrence of Xieite

General Appearance of Type Material:
compact polycrystalline aggregates of about 5―40 µm in grain size and commonly displays as pseudomorph of chromite crystals or its fragments.
Geological Setting of Type Material:
shock-produced veins of Suizhou L6 chondrite formed through solid-state transformation of chromite, and its occurrence is intimately associated with the shock veins of meteorite.
Empirical Formula:
Fe2+Cr2O4
Associated Minerals at Type Locality:

Relationship of Xieite to other Species

Member of:
Other Members of Group:
ChromiteFe2+Cr23+O4
Cochromite(Co,Ni,Fe)(Cr,Al)2O4
CoulsoniteFe2+V23+O4
CuprospinelCu2+Fe23+O4
Filipstadite(Sb0.5Fe0.5)Mn2O4
FrankliniteZn2+Fe23+O4
GahniteZnAl2O4
GalaxiteMn2+Al2O4
HercyniteFe2+Al2O4
JacobsiteMn2+Fe23+O4
MagnesiochromiteMgCr2O4
MagnesiocoulsoniteMgV2O4
MagnesioferriteMgFe23+O4
MagnetiteFe2+Fe23+O4
ManganochromiteMn2+Cr2O4
Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4
Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
SpinelMgAl2O4
TrevoriteNi2+Fe23+O4
UlvöspinelFe2TiO4
VuorelaineniteMn2+V23+O4
ZincochromiteZnCr2O4
4.BB.05ChromiteFe2+Cr2O4
4.BB.05CochromiteCoCr2O4
4.BB.05CoulsoniteFe2+V23+O4
4.BB.05CuprospinelCu2+Fe23+O4
4.BB.05Filipstadite(Mn2+,Mg)2(Sb5+,Fe3+)O4
4.BB.05FrankliniteZnFe23+O4
4.BB.05GahniteZnAl2O4
4.BB.05GalaxiteMn2+Al2O4
4.BB.05HercyniteFe2+Al2O4
4.BB.05JacobsiteMn2+Fe23+O4
4.BB.05ManganochromiteMn2+Cr2O4
4.BB.05MagnesiocoulsoniteMgV2O4
4.BB.05MagnesiochromiteMgCr23+O4
4.BB.05MagnesioferriteMgFe23+O4
4.BB.05MagnetiteFe2+Fe23+O4
4.BB.05Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4
4.BB.05QandiliteMg2(Ti,Fe3+,Al)O4
4.BB.05SpinelMgAl2O4
4.BB.05TrevoriteNiFe23+O4
4.BB.05UlvöspinelFe22+TiO4
4.BB.05VuorelaineniteMn2+V23+O4
4.BB.05ZincochromiteZnCr2O4
4.BB.10HausmanniteMn2+Mn23+O4
4.BB.10HetaeroliteZnMn23+O4
4.BB.10HydrohetaeroliteHZnMn3+5/3O4
4.BB.10IwakiiteMn2+Fe23+O4
4.BB.15MaghemiteFe2.67O4
4.BB.15TitanomaghemiteFe(Fe,Ti)2O4
4.BB.20TegengreniteMg2(Sb,Mn)O4

Other Names for Xieite

Name in Other Languages:
Simplified Chinese:谢氏超晶石

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 Xieite

Reference List:
Chen, M., Shu, J., Xie, X., Mao, H. (2003) Natural CaTi2O4-structured FeCr2O4 polymorph in the Suizhou meteorite and its significance in mantle mineralogy. Geochimica et Cosmochimica Acta: 67: 3937-3942.

Chen, M., Shu, J., Mao, H., Xie, X., Hemley, R.J. (2003) Natural occurrence and synthesis of two new postspinel polymorphs of chromite. Proceedings of the National Academy of Science USA: 100: 14651-14654.

Chen, M., Shu, J., Mao, H. (2008) Xieite, a new mineral of high pressure FeCr2O4 polymorph. Chinese Science Bulletin: 53: 3341-3345.

Xie, X., Chen, M., Wang, C. (2011) Occurrence and mineral chemistry of chromite and xieite in the Suizhou L6 chondrite. Science China Earth Sciences: 54(7): 998-1010.

Xie, X., Chen, M. (2016) Suizhou Meteorite: Mineralogy and Shock Metamorphism. Springer Geochemistry/Mineralogy: 255 pgs.

Internet Links for Xieite

mindat.org URL:
https://www.mindat.org/min-35792.html
Please feel free to link to this page.

Localities for Xieite

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.
(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
 
  • Mato Grosso
    • Juína
      • Sorriso river
Kaminski, F., Wirth R. (2017): Nitrides and carbonitrides from the lowermost mantle and their importance in the search for Earth’s "lost" nitrogen. American Mineralogist: 102 (in press); http://forum.amiminerals.it/viewtopic.php?t=13680 (2017)
China (TL)
 
  • Hubei Province
    • Suizhou Prefecture
      • Zengdu District (Cengdou District)
        • Xihe
Chen, M., Shu, J., Xie, X., Mao, H. (2003): Natural CaTi2O4-structured FeCr2O4 polymorph in the Suizhou meteorite and its significance in mantle mineralogy. Geochimica et Cosmochimica Acta, 67, 3937-3942; IMA website; Chen, M., Shu, J., & Mao, H. K. (2008). Xieite, a new mineral of high-pressure FeCr2O4 polymorph. Chinese Science Bulletin, 53(21), 3341-3345.; Chen, M., & Xie, X. (2015). Shock-produced akimotoite in the Suizhou L6 chondrite. Science China Earth Sciences, 58(6), 876-880.
Mineral and/or Locality  
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