Clinopyroxene tutorial Optical mineralogy

Several videos of clinopyroxenes in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: High relief, kind of crappy cleavage c. 90°-90°, faint green pleochroism, low to moderate interference colors, inclined extinction
00:00​ End section showing two cleavages
00:31​ Elongate prism, slight pleochroism, inclined extinction
01:01 Different orientations showing different interference colors
01:32​ Different orientations showing slight pleochroism

02:02​ Higher relief than adjacent hornblende (and quartz)
02:33 Higher relief than adjacent actinolite (and quartz)
03:03 Omphacite (high-pressure sodic pyroxene) in an eclogite
03:34 Omphacite with exsolution
04:04 High-temperature pyroxene with oxide exsolution

[janookii]

geostudent here! thank you so much for these videos!! they’re helping me so much 😊

[efetolgauysal]

Best regards from Hacettepe University Geological Engineering Department, thank you for the video.

[Alya]

Hello, I am from Uzbekistan. your videos are very interesting to me. Thank you for your hard work and for sharing with everyone. I hope I wrote correctly

[salsabilaainunnisa]

amazing video, it would be much better if you slow down a bit when rotating the stages so that we, beginners, can observe the characteristics more easily, thank you!

[jairprado]

As testuras faz parte das crivage relevo

[jorgeandrestaverareyes]

Hey Matt, do you know what minerals are exolved in the omphacite? Thank you