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Vibrational Spectra of Beryl from Xuebaoding, Pingwu County, Sichuan Province

GUO Yan-jun, WANG Ru-chang, XU Shi-jin   

  1. State Key Laboratory for Mineral Deposits Research and Department Earth Sciences, Nanjing University, Nanjing 210093, China
  • Received:2000-06-20 Revised:2000-06-20 Online:2000-06-20 Published:2000-06-20

Abstract: The natural beryl crystals are commonly prismatic. The tab ular ones are rarely observed. In this paper is given an example of tabular cry stal of beryl from the Xubaodi ng greisen, which merits a study of IR and Raman spectra and comparisons with tw o prismatic crystal samples of beryl from Xuebaoding quartz vein and Altai pegma tite. Both the tabular and prismatic beryls from Xubaoding are rich in Li and Na, their IR and Raman spectra are very similar, and the channel occupied water is mainly of type II, while the channel occupied water for Altai pegmatite is ma inly of type I. Spectral difference between beryl from Xuebaoding and that from Altai is mainly due to the replacement of Be by Li,which is in fact more strong in beryl from Xuebaoding.