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- Title
The Fe/Fe ratio in natural and heat-treated iron-rich eudialytes.
- Authors
Rastsvetaeva, R.; Aksenov, S.; Rozenberg, K.; Verin, I.
- Abstract
The structures of natural iron-rich eudialyte (specimen 3458 from the Khibiny massif, the Kola Peninsula) and two heat-treated samples of this mineral calcined at 700 and 800°C were determined by X-ray diffraction. The trigonal unit-cell parameters (sp. gr. R3 m) are as follows: a = 14.2645(1) Å, c = 29.9635(5) Å; a = 14.1307(1) Å, c = 30.1229(3) Å; a = 14.1921(2) Å, c = 30.2417(5) Å, respectively. It was found that Fe ions in the calcined eudialytes, as well as impurities in the starting specimen, occupy the square-pyramidal Fe(V) sites, whereas Fe ions are in the planar-tetragonal Fe(IV) sites.
- Subjects
IRON heat treatment; MOLECULAR structure; IRON ions; SILICATE minerals; TEMPERATURE effect; X-ray diffraction; POINT defects; EUDIALYTE
- Publication
Crystallography Reports, 2011, Vol 56, Issue 2, p202
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S1063774511020167