Quartz tutorial optical mineralogy
Channel: Matt Kohn
Date: 2021-04-28

Several videos of quartz in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: Low relief, colorless, low interference colors (maximum = white), deformation textures (e.g., domain extinction, serrated edges)
00:00 Pressure shadow (typical)
00:30 Unusual orientation
01:01 Dispersed grains
01:31 Just beginning to break into subgrains (undulose or undulatory extinction)
02:01 Breaking into smaller subgrains
02:32 Serrated edges - mylonitic
03:02 Mylonitic
03:33 Too thick (a little)
04:04 Interference figure