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Raman microspectrometry, FT-IR and inclusion characteristics of gem garnets from Tanzania and Madagascar

Journal of Geoscientific Research in Northeast Asia 2004年第2期7卷 125-135页

作者： Sang-kon Kim Maeng-eon Park Seung-gyun Baek Kyu-youl Sung Sun-ok Kim Hee-yul Park Department of Environmental Geoscience Pukyong National University Busan 608-737 KoreaDepartment of Environmental Geoscience Pukyong National University Busan 608-737 KoreaDepartment of Environmental Geoscience Pukyong National University Busan 608-737 KoreaDepartment of Environmental Geoscience Pukyong National University Busan 608-737 KoreaMinerals and Materials Processing Division Korea Institute of Geoscience and Mineral Resources Daejeon 305-350 KoreaSchool of Gemology Identification & Dealer Open Cyber University Seoul 110-750 Korea

Chemical composition, Raman microspectrometry, and Fourier transform infrared(FT-IR)and SEM-CL (Cathodluminescence)analyses are carried out for Tanzania and Madagascar garnets for locality identification. Inclusion study was sustained after electron probe microanalysis(EPMA). Needle-like illmenites, apatites and zircons were the most common solid inclusions in Tanzania garnets. Madagascar garnets revealed rutile needles and apatites were also observed, but differences in size, shape and distribution patterns were noticed compared to Tanzania garnets. Tanzania garnets exhibited all types of observable fluid inclusions such as"fingerprint"pattern, called Type I-A, liquid-only(L) single phase fluid inclusion, called Type I-B and Type II-A(L+S), Type II-B(L+V)and Type III-A(L+Sylvite+S), Type III-B(L+S+V), while no more than two phase fluid inclusions found in both Madagascar and Korea garnets even if all examined garnets from three localities retained"fingerprint"features, so called, partially healed fractures, in common. Chemical composition, Raman microspectrometry and Fourier transform infrared(FT-IR)analysis taken turned out to be useful methods for the purpose of this study. Using consequences of SEM-CL and inclusion study, accordingly, the locality identification of gem-quality garnets is capable of being available in further application for other kinds of gemstones.

关键词：宝石石榴石局部鉴定 SEM-CI 拉曼分光计

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