Cordierite tutorial Optical mineralogy

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Several videos of cordierite in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: low relief (like quartz), black and white interference (like quartz), yellow pleochroic haloes around accessory minerals, alteration along fractures (penninitization).
00:00 Sillimanite clot with cordierite corona
00:30 Altered/fractured
01:01 Close-up of altered/fractured. Also pleochroic haloes
01:32 Yellow pleochroic haloes. Also some fracturing and alteration
02:03 Intense yellow pleochroic haloes
02:33 Intense yellow pleochroic haloes
  1. Matt Kohn
  2. Optical petrography
  3. mineralogy
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Комментарии
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Thank you, your videos help me a lot in my studies!

greenprostochok
Автор

Nice pleochroism. I never understood why they call it pleochroic haloes till I saw this. I only saw the halloes in biotite where the halloes' pleochroism blends with the biotite pleochroism.

ciprianpopa
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Comparing with Plagioclase, and please explain about sectorial twinning.

sreenurk