Pleochroism and color tutorial Optical mineralogy
Channel: Matt Kohn
Date: 2021-05-08

A series of videos illustrating pleochroism and color in a range of minerals. Supported by Boise State University and the US National Science Foundation.
00:00 Introduction with yoderite (blue)
01:01 Biotite normal pleochroism
01:23 Glaucophane distinctive pleochroism
01:43 Pink andalusite cores
02:04 Subtle clintonite pink-green pleochroism
02:24 Orthopyroxene pink-green pleochroism
02:45 Three different minerals with blue, green, and yellow pleochrosim
03:05 Actinolite cores vs. hornblende rims
03:25 Pleochroic haloes around radioactive inclusions in biotite
03:46 Yellow pleochroic haloes in cordierite
04:07 "Normal" pleochroism in biotite
04:27 "Reverse" pleochroism in tourmaline (compared to biotite)
04:48 Pink, inherited core in zircon
05:08 Color-zoned garnet (also chemically zoned)
05:50 Texturally (not color) zoned garnet
06:10 Epidote cores and piemontite rims