GEOLOGY OF GEM DEPOSITS

摘要

This second edition is warmly welcomed by the community of geologists interested in gems and by gemologists interested in geology. The first edition, 7 years old, proved to be a classic for students and for scientists. The second edition mostly reiterates the same chapters, written by the same authors: the geology of diamond, corundum, emerald, other beryls, chrysoberyl, tanzanite and tsavorite, gem-bearing pegmatites, and jade. These chapters have been updated with new data from the recent literature, such as data on the Montepuez ruby deposit, Mozambique (among numerous other examples). The chapter "Tanzanite and Tsavorite" has been almost entirely rewritten by Giuliani and others, taking into account the recent work by this team. There is only one additional chapter, "Geology of Gems and Their Geographic Origin." This chapter underlines the necessity of first understanding the geology of gems before trying to establish criteria for geographic-origin determination.