Myrmekite tutorial Optical mineralogy
Channel: Matt Kohn
Date: 04/05/2021

Three videos of myrmekite (intergrowth of wormy/vermicular quartz in plagioclase) in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: Optical characteristics of quartz and feldspar (low relief, colorless, low interference colors), distinct quartz texture inside plagioclase crystal.
00:00 Myrmekitic growths, also vermicular quartz in biotite
00:30 Coarse plagioclase host with pervasive twinning
01:01 Developed along edges of large crystal