Orthopyroxene tutorial Optical mineralogy

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Several videos of orthopyroxene in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: high relief, moderately good cleavage, pink-green pleochroism, low interference colors, parallel extinction
00:00 This is about as good as the pink-green pleochroism gets
00:30 Parallel extinction
01:01 Range of orientations and interference colors
01:31 In a gabbro
  1. Matt Kohn
  2. Optical petrography
  3. mineralogy
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Комментарии
Автор

I was exactly looking for these introduction videos, thx for all of them.

zeyt
Автор

Thanks for these informative lessons. Some orthopyroxenes show first order gray and white colours similar to plagioclase. Is it due to different thin section thickness or difference in chemical composition, i.e. change in composition affecting its birefringence value?

cumhurbabaoglu
Автор

Feedback. Turned to fast. I play them at 0.25 speed but even thats too fast. Just one half rotation at snails pace. Otherwise great.

geoffgeoff