The crystal structure of a single crystal of synthetic Fe-bearing hydrous forsterite (Mg1.85 Fe0.14Si0.99H0.06O4) synthesized at 13.5 GPa and 1400 °C has been investigated using X-ray diffractometry. The data show a site occupancy of 96(3)%Mg + 4(1)%Fe + 0(4)%□ at the M1 site and a site occupancy of 89(3)%Mg + 8(1)%/Fe + 3(4)%□ at the M2 site, indicating that the cation vacancies at the octahedral M sites predominantly occur at the M2 site. The occupancy at the T site. was 99.0%Si(fixed) + 0(1)%Fe + 1(1)%□, indicating a small number of vacancies with no detectable Fe occupation. A comparison of the calculated bond distances and reported stretching frequencies of the polarized IR spectra shows that the most probable H atom locations are near to the edges of the MO6.
|Number of pages||5|
|Journal||Journal of Mineralogical and Petrological Sciences|
|Publication status||Published - 2007 Sep 29|
- Cation vacancy
- Hydrogen location
- Hydrous forsterite
ASJC Scopus subject areas