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Xieite

Formula:
Fe
2+
 
Cr
 
2
O
 
4
System:Orthorhombic
Dimorph of:Chromite


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

IMA status:Approved 2007
Nickel-Strunz 10th (pending) edition ID: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
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Type Occurrence of Xieite

Type Locality:Suizhou meteorite (Suizhou L6 chondrite), Dayanpo, Zengdu District, Suizhou Prefecture, Hubei Province, China
Geological Setting of type material:L6 chondrite meteorite

Physical Properties of Xieite

Density (measured):5.63 g/cm3

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:
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)

Chemical Properties of Xieite

Formula:
Fe
2+
 
Cr
 
2
O
 
4
All elements listed in formula:Cr, Fe, O
Empirical Formula:
Fe
2+
 
Cr
 
2
O
 
4

Relationship of Xieite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.BB.05Brunogeierite
(Ge,Fe)Fe
 
2
O
 
4
4.BB.05Chromite
FeCr
 
2
O
 
4
4.BB.05Cochromite
(Co,Ni,Fe)(Cr,Al)
 
2
O
 
4
4.BB.05Coulsonite
FeV
 
2
O
 
4
4.BB.05Cuprospinel
Cu
2+
 
Fe
3+
2
O
 
4
4.BB.05Filipstadite
(Mn,Mg)
 
2
(Sb
 
.5
Fe
 
.5
)O
 
4
4.BB.05Franklinite
Zn
2+
 
Fe
3+
2
O
 
4
4.BB.05Gahnite
ZnAl
 
2
O
 
4
4.BB.05Galaxite
(Mn,Fe,Mg)(Al,Fe)
 
2
O
 
4
4.BB.05Hercynite
FeAl
 
2
O
 
4
4.BB.05Jacobsite
Mn
2+
 
Fe
3+
2
O
 
4
4.BB.05Manganochromite
(Mn,Fe)(Cr,V)
 
2
O
 
4
4.BB.05Magnesiocoulsonite
MgV
 
2
O
 
4
4.BB.05Magnesiochromite
MgCr
 
2
O
 
4
4.BB.05Magnesioferrite
MgFe
3+
2
O
 
4
4.BB.05Magnetite
Fe
2+
 
Fe
3+
2
O
 
4
4.BB.05Nichromite
(Ni,Co,Fe)(Cr,Fe,Al)
 
2
O
 
4
4.BB.05Qandilite
(Mg,Fe)
 
2
(Ti,Fe,Al)O
 
4
4.BB.05Spinel
MgAl
 
2
O
 
4
4.BB.05Trevorite
Ni
2+
 
Fe
3+
2
O
 
4
4.BB.05Ulvöspinel
Fe
 
2
TiO
 
4
4.BB.05Vuorelainenite
(Mn,Fe)(V,Cr)
 
2
O
 
4
4.BB.05Zincochromite
ZnCr
 
2
O
 
4
4.BB.10Hausmannite
MnMn
 
2
O
 
4
4.BB.10Hetaerolite
ZnMn
 
2
O
 
4
4.BB.10Hydrohetaerolite
ZnMn
 
2
O
 
4
·H
 
2
O
4.BB.10Iwakiite
Mn(Fe,Mn)
 
2
O
 
4
4.BB.15Maghemite
Fe
 
2
O
 
3
4.BB.15Titanomaghemite
Fe
3+
 
(Fe
3+
 
,Ti
4+
 
,Fe
2+
 
,[])
 
2
O
 
4
4.BB.20Tegengrenite
(Mg,Mn
2+
 
)
 
2
Sb
5+
0.5
(Mn
3+
 
,Si,Ti)
 
0.5
O
 
4

Other Names for Xieite

Synonyms:
IMA2007-056
Other Languages:
Simplified Chinese:谢氏超晶石

Other Information

Health Warning: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., & H. Mao (2008): Xieite, a new mineral of high pressure FeCr2O4 polymorph. Chinese Science Bulletin 53,3341-3345(2008)

Internet Links for Xieite

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    Localities for Xieite

    (TL) indicates type locality. ? 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.
    China
     
    • Hubei Province
      • Suizhou Prefecture
        • Zengdu District
          • Dayanpo
    		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
    Mineral and/or Locality
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