Muscovite tutorial Optical mineralogy
Channel: Matt Kohn
Date: 03/05/2021

Several videos of muscovite in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: low/moderate relief, colorless (usually), high interference colors, birds' eye extinction..
00:00​ Typical coarse muscovite in a schist
00:30​ Igneous muscovite, birds' eye extinction
01:00​ Coarse, randomly oriented
01:30​ Fine-grained with graphite
02:00​ Coarse, in blueschist (=phengite)
02:30​ Coarse, in eclogite (=phengite)
03:00​ Fuchsite (Cr-muscovite)
03:30​ Muscovite art