Olivine tutorial Optical mineralogy
Channel: Matt Kohn
Date: 2021-05-05

Several videos of olivine in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: moderately high relief, arcuate fractures, moderately high interference colors, parallel extinction.
00:00 Several different orientations, moderately high relief, parallel extinction
00:31 Peridotite (dunite) showing arcuate fractures
01:02 Large phenocrysts in basalt
01:32 Closeup of large phenocryst
02:03 Phenocryst with rough cleavage