Скачать или смотреть Turning This Mineral Changes its Color; But Why?

If you turn this mineral specimen, it quickly changes to a different color. But why? The answer relates to a fascinating property of mineralogy known as pleochroism. Pleochroism can cause certain mineral specimens to appear as two or even three different colors and the range in-between under the same light source. This video is explained by a geologist.

Thumbnail Photo Credit: Garden State Minerals, Used with Permission

A special thanks to SRC Gems & Garden State Minerals for granting me permission to use video clips & images of their specimens!

Also, a special thanks to user toastoftime, who I directly quoted from (with permission) from 1m35s to 1m45s in today's video. Your help was appreciated!

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This video is protected under "fair use". If you see an image and/or video which is your own in this video, and/or think my discussion of a scientific paper (and/or discussion/mentioning of the data/information within a scientific paper) does not fall under the fair use doctrine, and wish for it to be censored or removed, contact me by email at [email protected] and I will make the necessary changes.

Various licenses used in sections of this video (not the entire video, this video as a whole does not completely fall under one of these licenses) and/or in this video's thumbnail image (and this list does not include every license used in this video and/or thumbnail image):
CC BY-SA 3.0 license: https://creativecommons.org/licenses/...

Sources/Citations:
[1] Mindat, https://www.mindat.org/
Note. All mineral data, including chemical formula and mineral optical data (isotropic, uniaxial, or biaxial) were cited from Mindat.org
[2] Mindat, "Zoisite", https://www.mindat.org/min-4430.html
[3] Mindat, "Iolite", https://www.mindat.org/min-5119.html
[4] Mindat, "Elbaite", https://www.mindat.org/min-1364.html
[5] International Mineralogical Association

0:00 Pleochroism
1:35 Pleochroism Criteria
1:52 Crystal Systems
2:09 Pleochroism Explained
3:32 Dichroic & Trichroic
4:03 Other Optical Phenomenon