Infrared spectra of fayalite crystal

¹ Subaru Telescope, 650 North Aohoku Place, Hilo, Hawaii 96720, USA
² Kyoto Pharmaceutical University, Yamashina, Kyoto, Japan
³ Osaka University, Department of Earth and Space Science, Toyonaka, Osaka, Japan
⁴ Communications Research Laboratory, Koganei, Tokyo, Japan

Corresponding author: H. Suto, suto@naoj.org

Received: 7 January 2002
Accepted: 28 March 2002

Abstract

Crystalline silicate is an important matter since the ISO discovery of crystalline silicate features in circumstellar dusty environments. Polarized infrared reflection spectra of crystal fayalite (Fe₂SiO₄), an end member of olivine solid solution, were measured for each crystal axis in infrared region up to 100 μm, and the oscillator parameters of the dielectric constants for each crystal axis are derived by fitting the reflection spectra. The optical constants derived by the oscillator parameters provide a useful standard for the optical characterization of fayalite.