R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy

[R2-16] Extra-framework sites of labuntsovite-Mn from Aris Quarries, Aris, Windhoek, Khomas, Namibia

*Yurie Nakamura¹, Kazumasa Sugiyama¹, Toshiro Nagase² (1. Tohoku Univ. IMR, 2. Tohoku Univ. Museum)

Keywords: labuntsovite, titanosilicate

Cation distribution in extra-framework site of labuntsovite-Mn from Namibia was investigated. No diffuse scattering was observed in the diffraction intensity in single crystal X-ray diffraction experiments. The intensity distribution shows the symmetry with the space group C2/m, and the lattice constants are a = 14.4109 Å, b = 13.9182 Å, c = 7.8214 Å, β = 117.043 °. This sample is considered to have no superstructure because the D site is 100% occupied by divalent cations.