Earth Optics Video 4: Uniaxial Minerals

In this video, I go through examples where I find a uniaxial interference figure and using it to determine optic sign.
For supplemental questions and resources, please check out my webpage at www.earthopticsmineralogy.com
Uniaxial Interference figure image: jm-derochette.be/Conoscopy/qua...
Michel-Levy Chart: University of Liverpool. D Flinn G Newall

[@upasnakarmakar1690]

MOST HELPFUL VIDEO!!!!! thank you so much. I've been confused about how to determine the optic sign when the melatope is out of view. This helped me a lot and helped me visualise. Thanks so much!!!

[@venkatasrikanth245]

Visual learning is the most efficient. 10 times fatser and deeper understanding than books. Thank you 💞.

[@kshitijredman3100]

Thank you, it was very helpful. Understood the concept completely.

[@user-ic2mz4zo9l]

It all makes sense now! Thank you for helping me understand and enjoy optical mineralogy.

[@brento2890]

Excellent !!! I have show this to my professor!!! Thank you. !!!

[@caviensatia5909]

OMG, THANK YOU SO VERY MUCH. Really appreciate the effort in making this video.

[@EarthOpticsVideos]

Thanks for the feedback! I'm glad it helped you :D

[@anirbanguha8579]

Just WOW explanation !!!

[@krishnauppar380]

Very helpful for beginners.thank u so much

[@omkarkawatgi88]

Best Explanation ever...

[@subhamgamer585]

its really helpful keep posting..

[@priyadarshinini8067]

Thank uuuu veryyyy much 🙏🙏🙏🙏 it's very very helpful to easily visualise and remember 😊😊🥰🥰...thanks once again.

[@Kecik409]

superb!

[@mapfuriratinotenda5456]

very understable thank yu

[@awsambdaman]

supperrrrrr helpful

[@alkeshjangid9249]

Your video is very good, I liked listening very much and I would like my friends to watch this video ... I am subscribing to your channel right now...!!

[@EarthOpticsVideos]

Thank you for watching and sharing!

[@pritamd47]

Hi, your videos are really helpful! However, following this video, when I insert the Bertrand lens, the image I obtain is not at all like this figure. What I get instead is a blurred out image of the normal image (the one where BL is not inserted). What am I doing wrong?

[@arin2250]

Are darker grains usually the ones with the lowest retardation, and therefore best to use for creating an interference figure?

[@obliquecolumn834]

How are you rotating your isogryres? By moving the thin section slides or by rotating the stage.

[@EarthOpticsVideos]

Good question! The isogyres are rotating on the screen as I rotate the stage. If you move your thin section, you run the risk of moving off-grain and losing your interference figure.

[@junaideej.k7634]

1)can someone explain how and why does the Bertrand lens change the colour of the light? i can't understand the physics of the optics here...

[@heathergunn9235]

Junaidee Jimmy Kok I don’t think the Bertrand lens is changing the color I think it’s the accessory plate, which is usually a thin sheet of gypsum which vibrates at 550 nm. It changes the color because it either slows down or speeds up the light wave creating constructive or destructive wave which allows the color to change.

[@AlexSciChannel]

HOW THE FUCK DO I GET A GOOD SAMPLE AND HOW DO I GET IT PROPERLY CENTERED?! SO GOD DAMN FRUSTRATING!!!