Gemstones often show abnormal extinction under polariscope. This paper gives a summary and explanation to these phenomena, with the purpose of helping testers judge the optic characters of gemstones more accurately.
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李平 崔文元,2003,偏光镜下宝石消光异常的解析[J].岩石矿物学杂志,22(1):105~106. LI Ping, CUI Wen_yuan,2003,A discussion on abnormal phenomena of gemstones under polariscope[J]. Acta Petrologica et Mineralogica,22(1):105~106.
