Where Is Titanium Hiding? Structure of a Potentially New Mineral from the Vesuvianite Group

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Abstract

Minerals of the Vesuvianite group are complex ortho-diortho silicates of Са, Al, Fe, and some other elements. Vesuvianite with 5.85 wt. % of TiO2, from the Shigar Valley in northern Pakistan, has been investigated by means of the X-ray structural analysis and Mössbauer spectroscopy. Tetragonal unit-cell parameters are a = 15.5326(2), c =11.8040(2) Å, space group, P4/nnc. It has been established that Ti does not occupy the Y1-site as was previously believed, but is found in the octahedral site Y3, together with Al, Fe2+, and Fe3+. The role of the Y1 site in the diversity of vesuvianite-group minerals is discussed.

About the authors

R. K Rastsvetaeva

Shubnikov Institute of Crystallography, Federal Scientifi c Research Centre “Crystallography and Photonics”, Russian Academy of Sciences

Email: rast.crys@gmail.com
Moscow, Russia

S. M Aksenov

Federal Research Centre “Kola Science Centre of the Russian Academy of Sciences”

Email: aks.crys@gmail.com
Apatity, Russia

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