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

[R1P-12] Gobelinite and its Ni-analogue from the Nakauri mine, Aichi Prefecture, Japan

*Norimasa Shimobayashi¹, Masaki Takaya¹, Daisuke Nishio-Hamane², Masayuki Ohnishi, Takefumi Niwa³ (1. Kyoto Univ. Sci., 2. Univ. of Tokyo ISSP, 3. Min. Soc. Nagoya)

Keywords:Ktenasite, gobelinite, Ni-analogue, Nakauri mine, new mineral

Ktenasite-like mineral was found in a boulder from the Nakauri Mine, Aichi Prefecture, Japan, and EPMA analysis revealed that the Zn in ktenasite was replaced by Ni and Co. The Co-analogue of ktenasite was approved in 2018 as a new mineral gobelinite. The present sample found at the Nakauri Mine has an intermediate composition of approximately 1:1 Co:Ni, and shows a compositional range from gobelinite, which is first reported in Japan, to its Ni-analogue, which is an unknown mineral. The latter Ni-analogue of gobelinite has been submitted to IMA-CNMNC as a new mineral (2022-065).