R1: Characterization and description of minerals (Joint Session with The Gemmological Society of Japan)

[R1-07] Local structure of Ni and Ni minerals in listvenite in the Nishisonogi unit Nagasaki metamorphic rocks

*Kohei Unoki¹, Tadao Nishiyama¹, Ginga Kitahara¹, Akira Yoshiasa¹, Makoto Tokuda², Kunio Yubuta³, Kazumasa Sugiyama² (1. Kumamoto Uni. Sci., 2. Tohoku Uni., 3. Kyushu Uni.)

Keywords:listvenite (listwanite), Ni minerals

We conducted a mineralogical study of the Ni minerals contained in the Nagasakihisui-listvenite in the Nagasaki metamorphic Nishisonogi unit. There are various kinds of Ni minerals are produced in the Nagasakihisui-listvenite. The Debye temperature θD of Ni minerals was estimated. A new phase diagram is proposed in the system of ulmannite and gersdorffite. In addition, the P-T conditions are estimated from the crystal structure analyses of pentlandite. From the XAFS analysis, the local structure around Ni in the pure-green part of Nagasakihisui-listvenite was determined.