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

[R1-02] Compositional dependence of peak intensity tensor of Mössbauer quadrupole doublet due to Fe²⁺ at the M2site of Ca-poor orthopyroxene

*Keiji Shinoda¹, Keita Onoue¹, Yasuhiro Kobayashi² (1. Osaka Metropolitan Univ. Sci., 2. KURNS)

Keywords:Mössbauer spectroscopy, peak intensity tensor, Ca-poor pyroxene

Mössbauer spectra of thin sections of single crystal of two Ca-poor pyroxenes were measured to confirm compositional dependences of peak intensity tensor from intensity variation of quadrupole doublet. Three components of the intensity tensor of Fe-poor and Fe-rich ortho-pyroxene suggest that I_XX and I_ZZ show weak chemical dependence of Fe²⁺ and I_YYis independent of Fe²⁺ components. This indirectly suggests that the intensity tensor of Fe ions at the M sites of pyroxene is independent of Ca-contents.