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4:35
YouTube
Matt Kohn
Biotite tutorial Optical mineralogy
Several videos of Biotite in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation. Key characteristics: Pleochroic in brown/reddish brown, pleochroic haloes, high interference colors, birds' eye extinction 00:00 Typical single crystal showing brown ...
15.2K views
Apr 29, 2021
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