Crystal Chemistry of Iron in Non-Metamict Chevkinite-(Ce): Valence State and Site Occupation Proportions

  • Yang Z
  • Li H
  • Liu M
 et al. 
  • 4


    Mendeley users who have this article in their library.
  • 4


    Citations of this article.


The ideal formula for chevkinite can be expressed as A4BC2D2Si4O22. It is important to determine the valence state and site occupation proportions for Fe among the B, C, and D octahedral sites as it may help to identify different species in the chevkinite group. Non-metamict chevkinite-(Ce) from Mianxi alkali feldspar-granite, Sichuan Province, China, was investigated using Mössbauer spectroscopy. The Fe3+/ΣFe ratio was 39.2%. A significant increase of Fe3+occured during metamictization and annealing for chevkinite-group minerals. In metamict samples Fe tended to lower coordination. According to the correlation between bond length and isomer shift (IS), the quadrupole doublets with IS = 1.10 and 0.94 mm·s-1can be assigned to Fe2+in the B and C octahedral sites, respectively. Based on the correlation between octahedral distortion and quadrupole splitting (QS), the quadrupole doublets with QS = 0.86 and 0.77 mm·s-1can be assigned to Fe3+in the C and D sites, respectively. The simplified formula can be revised as: Ce4Fe2+(Ti, Fe2+, Fe3+)2(Ti, Fe3+)2Si4(O, OH)22. It indicated that the non-metamict chevkinite-(Ce) belonged to Fe2+end member of the chevkinite group because Fe2+was the predominant component in the B site. © 2007 The Chinese Society of Rare Earths.

Author-supplied keywords

  • Chevkinite-(Ce), Mössbauer spectroscopy
  • bond length
  • rare earths
  • valence state

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Zhuming Yang

  • He Li

  • Milan Liu

  • Pertlik Franz

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free