2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
[R2-05]Crystal chemistry of Au1-xAgxTe2 minerals: structure analyses krennerite (x=0.13) and sylvanite (x=0.32)[Presentation award entry]
*Ginga Kitahara1, Akira Yoshiasa1, Hidetomo Hongu1, Makoto Tokuda2, Kazumasa Sigiyama2, Koichi Momma3, Ritsuro Miyawaki3(1. Kumamoto Univ. Sci., 2. Tohoku Univ. IMR, 3. National Museum)
Keywords:
krennerite,sylvanite,single crystal diffraction,XAFS,chemical formula
The structures analyses on krennerite (Au0.87Ag0.13Te2) and sylvanite (Au0.68Ag0.32Te2) were performed using single crystal X-ray diffraction and XAFS (X-ray absorption fine structure) experiments. The chemical formula of krennerite and sylvanite can be expressed as Au3+2(Au1+2-xAg1+x)[Te3]2-[Te2]2-2Te2-, and Au3+(Au1+1-xAg1+x) [Te2]2-2, respectively.