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GEMS & GEMOLOGY Winter 1999 In recent years, the historic demantoid deposits have been reworked and new deposits have been uncovered in the Urals. Demantoid garnets recently mined from these Russian deposits have been observed to contain distinctive acicular inclusions (see, e.g., figure 15 of Phillips and Talantsev, 1996), sometimes accompanied by horsetails. The goal of the present study was to identify these acicular inclusions by means of laser Raman microspectrometry. Although Raman analysis has been used in mineralogical research for many years (see, e.g., Moore et al., 1971; Griffith, 1987), it is a relatively new technique in most gemological laboratories. Nevertheless, several authors have described gemological applications of Raman microspectrometry, which is an excellent tool for the nondestructive analysis of inclusions in gemstones (see, e.g., DeléDubois et al., 1980; Hänni et al., 1998; Koivula and Elen, 1998). The Raman-shift effect measured by the instrument is due to the molecular vibrations within a substance during its exposure to an intense monochromatic light source, usually a visible laser (Long, 1977; McMillan and Hofmeister, 1988). Minerals that have DIOPSIDE NEEDLES AS INCLUSIONS IN DEMANTOID GARNET FROM RUSSIA: A RAMAN MICROSPECTROMETRIC STUDY

Diopside Needles as Inclusions in Demantoid Garnet From Russia: A Raman Microspectrometric Study