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  • Undulose extinction or undulatory extinction is a geological term referring to the type of extinction that occurs in certain minerals when examined in thin section under cross polarized light. Undulose extinction is very common in quartz, so much so that it is. — “Undulose extinction - Wikipedia, the free encyclopedia”,
  • Undulose extinction is part of WikiProject Geology, an attempt at creating a standardized, informative, comprehensive and easy-to-use geology resource. If you would like to participate, you can choose to edit this article, or visit the project page for more information. Stub. — “Talk:Undulose extinction - Wikipedia, the free encyclopedia”,
  • Undulose extinction in quartz. Extinction is a term used in optical mineralogy and petrology, which describes when cross Minerals with undulose extinction, solid solution/zonation, or other factors (e.g. Bird's eye extinction in mica) that may inhibit this measure. — “Extinction angle - Wikipedia, the free encyclopedia”,


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