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

[R2-03] Crystal structure of low-symmetry cassiterite from Ohtani mine, Kyoto, Japan

*Kazuki Kanazawa¹, Takahiro Kuribayashi¹, Toshiro Nagase² (1. Tohoku Univ. Sci., 2. Tohoku Univ. Mus.)

Keywords:cassiterite, single-crystal X-ray diffraction, optical anomaly

The biaxial cassiterite was investigated by single-crystal X-ray diffraction method. The systematic absence of reflections of the space group P4₂/mnm were measured on the both {231} and {111} sector. The structural refinement on the {231} sector was performed by the space groups of P2/m. The {111} sector may have different crystal structure from {231} sector.